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Structural and electronic properties of oxide structures and oxide interfaces

Applicant Triscone Jean-Marc
Number 179155
Funding scheme Project funding
Research institution Département de Physique de la Matière Condensée Université de Genève
Institution of higher education University of Geneva - GE
Main discipline Condensed Matter Physics
Start/End 01.04.2018 - 31.03.2022
Approved amount 1'718'913.00
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Keywords (10)

Systems with strong electronic correlations; Transport properties; Low dimensional systems; Oxide interfaces; 2D superconductivity; Interface engineering; 1D and 1D coupled systems; Superconductivity; Local electronic writing; Field effect

Lay Summary (French)

Lead
Propriétés structurelles et électroniques de structures d'oxydes et d’interfaces d'oxydesLe projet va étudier la « célèbre » interface entre du LaAlO3 et du SrTiO3 - deux isolants - qui s’est révélée être conductrice et supraconductrice, et des structures à base de nickelates - une famille étonnante de composés connus pour leur transition métal-isolant.
Lay summary

Objectifs du projet :Le projet propose d’étudier : les propriétés de l'interface entre le LaAlO3et SrTiOdans des nano-fils réalisés artificiellement ; le diagramme de phase supraconducteur du système ; les inhomogénéités possibles dans la région sous-dopée ; et le rôle possible de fluctuations ferroélectriques sur la supraconductivité. Concernant les nickelates, RENiO3, nous étudierons : les propriétés de films minces d’une solution solide pour laquelle la température de transition métal-isolant (TMI) est proche de 0K - on s'attend dans cette région à une forte sensibilité du système aux distorsions ; les transitions métal-isolant dans des superréseaux de NdNiO3et SmNiO3- deux matériaux ayant des TMI très différentes. La dernière partie du projet propose de développer l'épitaxie par jets moléculaires d'oxydes pour explorer la réalisation de systèmes bidimensionnels.

 

Contexte du projet :Les oxydes de métaux de transition de structure perovskite font partie d'une famille de composés qui présentent une grande diversité de propriétés. Des composés métalliques supraconducteurs, ferromagnétiques, diélectriques, ferroélectriques, ou multiferroïques se retrouvent dans cette famille de matériaux. Leurs mailles cristallines similaires permettent la réalisation de structures artificielles. La sensibilité de ces matériaux aux contraintes épitaxiales, au confinement quantique et aux effets interfaciaux peut conduire à de nouvelles phases intéressantes et à une physique passionnante.

Direct link to Lay Summary Last update: 03.04.2018

Responsible applicant and co-applicants

Employees

Project partner

Publications

Publication
Designing and controlling the properties of transition metal oxide quantum materials
Ahn Charles, Cavalleri Andrea, Georges Antoine, Ismail-Beigi Sohrab, Millis Andrew J., Triscone Jean-Marc (2021), Designing and controlling the properties of transition metal oxide quantum materials, in Nature Materials, 20(11), 1462-1468.
Crossover between distinct symmetries in solid solutions of rare earth nickelates
Fowlie Jennifer, Mundet Bernat, Toulouse Constance, Schober Alexander, Guennou Mael, Domínguez Claribel, Gibert Marta, Alexander Duncan T. L., Kreisel Jens, Triscone Jean-Marc (2021), Crossover between distinct symmetries in solid solutions of rare earth nickelates, in APL Materials, 9(8), 081119-081119.
Electronic transport in submicrometric channels at the LaAlO3/SrTiO3 interface
Boselli Margherita, Scheerer Gernot, Filippone Michele, Luo Weiwei, Waelchli Adrien, Kuzmenko Alexey B., Gariglio Stefano, Giamarchi Thierry, Triscone Jean-Marc (2021), Electronic transport in submicrometric channels at the LaAlO3/SrTiO3 interface, in Physical Review B, 103(7), 075431-075431.
Ferroelectricity, Superconductivity, and SrTiO3—Passions of K.A. Müller
Scheerer Gernot, Boselli Margherita, Pulmannova Dorota, Rischau Carl Willem, Waelchli Adrien, Gariglio Stefano, Giannini Enrico, van der Marel Dirk, Triscone Jean-Marc (2020), Ferroelectricity, Superconductivity, and SrTiO3—Passions of K.A. Müller, in Condensed Matter, 5(4), 60-60.
Length scales of interfacial coupling between metal and insulator phases in oxides
Domínguez Claribel, Georgescu Alexandru B., Mundet Bernat, Zhang Yajun, Fowlie Jennifer, Mercy Alain, Waelchli Adrien, Catalano Sara, Alexander Duncan T. L., Ghosez Philippe, Georges Antoine, Millis Andrew J., Gibert Marta, Triscone Jean-Marc (2020), Length scales of interfacial coupling between metal and insulator phases in oxides, in Nature Materials, 19(11), 1182-1187.
Optical properties of LaNiO3 films tuned from compressive to tensile strain
Ardizzone I., Zingl M., Teyssier J., Strand H. U. R., Peil O., Fowlie J., Georgescu A. B., Catalano S., Bachar N., Kuzmenko A. B., Gibert M., Triscone J.-M., Georges A., van der Marel D. (2020), Optical properties of LaNiO3 films tuned from compressive to tensile strain, in Physical Review B, 102(15), 155148-155148.
Probing photoinduced rearrangements in the NdNiO3 magnetic spiral with polarization-sensitive ultrafast resonant soft x-ray scattering
Beyerlein K. R., Disa A. S., Först M., Henstridge M., Gebert T., Forrest T., Fitzpatrick A., Dominguez C., Fowlie J., Gibert M., Triscone J.-M., Dhesi S. S., Cavalleri A. (2020), Probing photoinduced rearrangements in the NdNiO3 magnetic spiral with polarization-sensitive ultrafast resonant soft x-ray scattering, in Physical Review B, 102(1), 014311-014311.
Vibrational properties of LaNiO 3 films in the ultrathin regime
Schober Alexander, Fowlie Jennifer, Guennou Mael, Weber Mads C., Zhao Hongjian, Íñiguez Jorge, Gibert Marta, Triscone Jean-Marc, Kreisel Jens (2020), Vibrational properties of LaNiO 3 films in the ultrathin regime, in APL Materials, 8(6), 061102-061102.
Electric control of a spin current has potential for low-power computing
Gariglio Stefano (2020), Electric control of a spin current has potential for low-power computing, in Nature, 580(7804), 458-459.
Role of point and line defects on the electronic structure of LaAlO 3 /SrTiO 3 interfaces
Gloter Alexandre, Tieri Giulio, Li Danfeng, Caputo Marco, Strocov Vladimir N., Stéphan Odile, Triscone Jean-Marc, Gariglio Stefano (2020), Role of point and line defects on the electronic structure of LaAlO 3 /SrTiO 3 interfaces, in APL Materials, 8(4), 041103-041103.
Artificial quantum confinement in LaAlO3/SrTiO3 heterostructures
Caputo M., Boselli M., Filippetti A., Lemal S., Li D., Chikina A., Cancellieri C., Schmitt T., Triscone J.-M., Ghosez P., Gariglio S., Strocov V. N. (2020), Artificial quantum confinement in LaAlO3/SrTiO3 heterostructures, in Physical Review Materials, 4(3), 035001-035001.
High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces
Luo Weiwei, Boselli Margherita, Poumirol Jean-Marie, Ardizzone Ivan, Teyssier Jérémie, van der Marel Dirk, Gariglio Stefano, Triscone Jean-Marc, Kuzmenko Alexey B. (2019), High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces, in Nature Communications, 10(1), 2774-2774.
Scale-invariant magnetic textures in the strongly correlated oxide NdNiO3
Li Jiarui, Pelliciari Jonathan, Mazzoli Claudio, Catalano Sara, Simmons Forrest, Sadowski Jerzy T., Levitan Abraham, Gibert Marta, Carlson Erica, Triscone Jean-Marc, Wilkins Stuart, Comin Riccardo (2019), Scale-invariant magnetic textures in the strongly correlated oxide NdNiO3, in Nature Communications, 10(1), 4568-4568.
Thickness-Dependent Perovskite Octahedral Distortions at Heterointerfaces
Fowlie Jennifer, Lichtensteiger Céline, Gibert Marta, Meley Hugo, Willmott Philip, Triscone Jean-Marc (2019), Thickness-Dependent Perovskite Octahedral Distortions at Heterointerfaces, in Nano Letters, 19(6), 4188-4194.
A spin–orbit playground: surfaces and interfaces of transition metal oxides
Gariglio S, Caviglia A D, Triscone J-M, Gabay M (2019), A spin–orbit playground: surfaces and interfaces of transition metal oxides, in Reports on Progress in Physics, 82(1), 012501-012501.
Complex magnetic order in nickelate slabs
Hepting M., Green R. J., Zhong Z., Bluschke M., Suyolcu Y. E., Macke S., Frano A., Catalano S., Gibert M., Sutarto R., He F., Cristiani G., Logvenov G., Wang Y., van Aken P. A., Hansmann P., Le Tacon M., Triscone J.-M., Sawatzky G. A., Keimer B., Benckiser E. (2018), Complex magnetic order in nickelate slabs, in Nature Physics, 14(11), 1097-1102.
Probing Quantum Confinement and Electronic Structure at Polar Oxide Interfaces
Li Danfeng, Lemal Sébastien, Gariglio Stefano, Wu Zhenping, Fête Alexandre, Boselli Margherita, Ghosez Philippe, Triscone Jean-Marc (2018), Probing Quantum Confinement and Electronic Structure at Polar Oxide Interfaces, in Advanced Science, 5(8), 1800242-1800242.

Datasets

Probing Quantum Confinement and Electronic Structure at Polar Oxide Interfaces

Author Li, Danfeng; Lemal, Sébastien; Gariglio, Stefano; Wu, Zhenping; Fête, Alexandre; Boselli, Margherita; Ghosez, Philippe; Triscone, Jean-Marc
Publication date 24.06.2018
Persistent Identifier (PID) 10.26037/yareta:67wx2i7mpjg4nh6gjbtroxfdpy
Repository Yareta
Abstract
Polar discontinuities occurring at interfaces between two materials constitute both a challenge and an opportunity in the study and application of a variety of devices. In order to cure the large electric field occurring in such structures, a reconfiguration of the charge landscape sets in at the interface via chemical modifications, adsorbates, or charge transfer. In the latter case, one may expect a local electronic doping of one material: one example is the two-dimensional electron liquid (2DEL) appearing in SrTiO3 once covered by a polar LaAlO3 layer. Here, it is shown that tuning the formal polarization of a (La,Al)1−x(Sr,Ti)xO3 (LASTO:x) overlayer modifies the quantum confinement of the 2DEL in SrTiO3 and its electronic band structure. The analysis of the behavior in magnetic field of superconducting field-effect devices reveals, in agreement with ab initio calculations and self-consistent Poisson-Schrödinger modeling, that quantum confinement and energy splitting between electronic bands of different symmetries strongly depend on the interface total charge densities. These results strongly support the polar discontinuity mechanisms with a full charge transfer to explain the origin of the 2DEL at the celebrated LaAlO3/SrTiO3 interface and demonstrate an effective tool for tailoring the electronic structure at oxide interfaces.

Thickness-Dependent Perovskite Octahedral Distortions at Heterointerfaces

Author Fowlie, Jennifer; Lichtensteiger, Céline; Gibert, Marta; Meley, Hugo; Willmott, Philip; Triscone, Jean-Marc
Publication date 22.05.2019
Persistent Identifier (PID) 10.26037/yareta:my3bdfiovfhunannc4slmmikwu
Repository Yareta
Abstract
In this study, we analyze how the octahedral tilts and rotations of thin films of LaNiO3 and LaAlO3 grown on different substrates, determined using synchrotron X-ray diffraction-measured half-integer Bragg peaks, depend upon the total film thickness. We find a striking difference between films grown on SrTiO3 and LaAlO3 substrates which appears to stem not only from the difference in epitaxial strain state but also from the level of continuity at the heterointerface. In particular, the chemically and structurally discontinuous LaNiO3/SrTiO3 and LaAlO3/SrTiO3 interfaces cause a large variation in the octahedral network as a function of film thickness whereas the rather continuous LaNiO3/LaAlO3 interface seems to allow from just a few unit cells the formation of a stable octahedral pattern corresponding to that expected only given the applied biaxial strain.

Artificial quantum confinement in LaAlO3/SrTiO3 heterostructures

Author Caputo, Marco; Boselli, Margherita; Filippetti, Alessio; Lemal, Sébastien; Li, Danfeng; Chikina, A.; Cancellieri, Claudia; Schmitt, Thorsten; Triscone, Jean-Marc; Ghosez, Philippe; Gariglio, Stefano; Strocov, Vladimir
Publication date 09.03.2020
Persistent Identifier (PID) 10.26037/yareta:v22m3sedqfbu3bwji6sk6f5wmu
Repository Yareta
Abstract
Heterostructures of transition metal oxides perovskites represent an ideal platform to explore exotic phenomena involving the complex interplay between the spin, charge, orbital and lattice degrees of freedom available in these compounds. At the interface between such materials, this interplay can lead to phenomena that are present in none of the original constituents such as the formation of the interfacial two-dimensional electron system (2DES) discovered at the LAO3/STO3 (LAO/STO) interface. In samples prepared by growing a LAO layer onto a STO substrate, the 2DES is confined in a band bending potential well, whose width is set by the interface charge density and the STO dielectric properties, and determines the electronic band structure. Growing LAO (2 nm)/STO (x nm)/LAO (2 nm) heterostructures on STO substrates allows us to control the extension of the confining potential of the top 2DES via the thickness of the STO layer. In such samples, we explore the electronic structure trend under an increase of the confining potential with using soft X-ray angle-resolved photoemission spectroscopy combined with ab initio calculations. The results indicate that varying the thickness of the STO film modifies the quantization of the 3dt2g bands and, interestingly, redistributes the charge between the dxy and dxz/dyz bands.

Vibrational properties of LaNiO3 films in the ultrathin regime

Author Schober, Alexander; Fowlie, Jennifer; Guennou, Mael; Weber, Mads C.; Zhao, Honjian; Iniguez, Jorge; Gibert, Marta; Triscone, Jean-Marc; Kreisel, Jens
Publication date 02.06.2020
Persistent Identifier (PID) 10.26037/yareta:g5dhhgcumnbshbxywnxhu4xyya
Repository Yareta
Abstract
Collective rotations and tilts of oxygen polyhedra play a crucial role in the physical properties of complex oxides such as magnetism and conductivity. Such rotations can be tuned by preparing thin films in which dimensionality, strain, and interface effects come into play. However, little is known of the tilt and rotational distortions in films a few unit cells thick including the question of if coherent tilt patterns survive at all in this ultrathin limit. Here, a series of films of perovskite LaNiO3 is studied and it is shown that the phonon mode related to oxygen octahedral tilts can be followed by Raman spectroscopy down to a film thickness of three pseudocubic perovskite unit cells (∼1.2 nm). To push the limits of resolution to the ultrathin regime, a statistical analysis method is introduced to separate the Raman signals of the film and substrate. Most interestingly, these analyses reveal a pronounced hardening of the tilt vibrational mode in the thinnest films. A comparison between the experimental results, first principles simulations of the atomic structure, and the standing wave model, which accounts for size effects on the phononic properties, reveals that in the ultrathin regime, the Raman spectra are a hybrid entity of both the bulk and surface phononic behavior. These results showcase Raman spectroscopy as a powerful tool to probe the behavior of perovskite films down to the ultrathin limit.

Ferroelectricity, Superconductivity, and SrTiO3 - Passions of K.A. Müller

Author Scheerer, Gernot; Boselli, Margherita; Pulmannova, Dorota; Rischau, Carl Willem; Waelchli, Adrien; Gariglio, Stefano; Giannini, Enrico; van der Marel, Dirk; Triscone, Jean-Marc
Publication date 15.10.2020
Persistent Identifier (PID) 10.26037/yareta:5rejm5foaba3nns3wm4sl5gxbu
Repository Yareta
Abstract
SrTiO3 is an insulating material which, using chemical doping, pressure, strain or isotope substitution, can be turned into a ferroelectric material or into a superconductor. The material itself, and the two aforementioned phenomena, have been subjects of intensive research of Karl Alex Müller and have been a source of inspiration, among other things, for his Nobel prize-winning research on high temperature superconductivity. An intriguing outstanding question is whether the occurrence of ferroelectricity and superconductivity in the same material is just a coincidence, or whether a deeper connection exists. In addition there is the empirical question of how these two phenomena interact with each other. Here we show that it is possible to induce superconductivity in a two-dimensional layer at the interface of SrTiO3 and LaAlO3 when we make the SrTiO3 ferroelectric by means of18 O substitution. Our experiments indicate that the ferroelectricity is perfectly compatible with having a superconducting two-dimensional electron system at the interface. This provides a promising avenue for manipulating superconductivity in a non centrosymmetric environment.

Role of point and line defects on the electronic structure of LaAlO3/SrTiO3 interfaces

Author Gloter, Alexandre; Giulio, Tieri; Li, Danfeng; Caputo, Marco; Strocov, Vladimir N.; Stéphan, Odile; Triscone, Jean-Marc; Gariglio, Stefano
Publication date 01.04.2020
Persistent Identifier (PID) 10.26037/yareta:clk5af36yjgkdocrwb4nw5h574
Repository Yareta
Abstract
Realization of heterostructures containing multiple two-dimensional electron liquids requires a fine control of the fabrication process. Here, we report a structural and spectroscopy study of LaAlO3/SrTiO3/LaAlO3 trilayers grown on the SrTiO3 substrate by pulsed-laser deposition. Scanning transmission electron microscopy with the help of ab initio calculations reveals that antisite defects associated with oxygen vacancies are primarily present in the SrTiO3 film (STO-f) close to the p-type interface (STO-f/LaAlO3), while oxygen vacancies prevail close to the top n-type interface (LaAlO3/STO-f). At the same interface, misfit dislocations relax the tensile strain of the top LaAlO3 layer. Combining x-ray absorption spectroscopy, x-ray linear dichroism, resonant photoemission spectroscopy, and electron energy loss spectroscopy, we observe that the 3d orbital reconstruction at the interface between LaAlO3 and the SrTiO3 substrate is confined over a few interfacial Ti planes while, at the top n-type interface (LaAlO3/STO-f), the absence of a dichroic signal can be related to the blurring of the interfacial orbital reconstruction due to the heterogeneity of defects.

Optical properties of LaNiO3 films tuned from compressive to tensile strain

Author Ardizzone, Ivan; Zingl, Manuel; Teyssier, Jérémie; Strand, Hugo U. R.; Peil, Oleg; Fowlie, Jennifer; Georgescu, Alexandre B.; Catalano, Sara; Bachar, Nimrod; Kuzmenko, Alexey B.; Gibert, Marta; Triscone, Jean-Marc; Georges, Antoine; van der Marel, Dirk
Publication date 29.09.2020
Persistent Identifier (PID) 10.26037/yareta:jif2uzxdfrgctma6b4rknipqoe
Repository Yareta
Abstract
This data set contains optical reflectivity, ellipsometry, optical conductivity, and transport experimental data and Density Function Theory numerical calculations of thin films of LaAlO3 on substrates of YAlO3, NdAlO3, LaAlO3, NdGaO3, and SrTiO3. The data were generated and analyzed during a study of the strain tuning of the optical properties of LaNiO3 films.Abstract: Materials with strong electronic correlations host remarkable -- and technologically relevant -- phenomena such as magnetism, superconductivity and metal-insulator transitions. Harnessing and controlling these effects is a major challenge, on which key advances are being made through lattice and strain engineering in thin films and heterostructures, leveraging the complex interplay between electronic and structural degrees of freedom. Here we show that the electronic structure of LaNiO3 can be tuned by means of lattice engineering. We use different substrates to induce compressive and tensile biaxial epitaxial strain in LaNiO3 thin films. Our measurements reveal systematic changes of the optical spectrum as a function of strain and, notably, an increase of the low-frequency free carrier weight as tensile strain is applied. Using density functional theory (DFT) calculations, we show that this apparently counter-intuitive effect is due to a change of orientation of the oxygen octahedra.The calculations also reveal drastic changes of the electronic structure under strain, associated with a Fermi surface Lifshitz transition. We provide an online applet to explore these effects. The experimental value of integrated spectral weight below 2 eV is significantly (up to a factor of 3) smaller than the DFT results, indicating a transfer of spectral weight from the infrared to energies above 2 eV. The suppression of the free carrier weight and the transfer of spectral weight to high energies together indicate a correlation-induced band narrowing and free carrier mass enhancement due to electronic correlations. Our findings provide a promising avenue for the tuning and control of quantum materials employing lattice engineering.

High sensitivity variable-temperature infrared nanoscopy of conducting oxide interfaces

Author Kuzmenko, Alexey B.; Luo, Weiwei; Boselli, Margherita; van der Marel, Dirk; Triscone, Jean-Marc; Poumirol, Jean-Marie; Gariglio, Stefano; Ardizzone, Ivan; Teyssier, Jérémie
Publication date 01.12.2020
Persistent Identifier (PID) 10.26037/yareta:cgvjv45ogffi3obuwfizlgvfty
Repository Yareta
Abstract
Probing the local transport properties of two-dimensional electron systems (2DES) confined at buried interfaces requires a non-invasive technique with a high spatial resolution operating in a broad temperature range. In this paper, we investigate the scattering-type scanning near field optical microscopy as a tool for studying the conducting LaAlO3/SrTiO3 interface from room temperature down to 6 K. We show that the near-field optical signal, in particular its phase component, is highly sensitive to the transport properties of the electron system present at the interface. Our modeling reveals that such sensitivity originates from the interaction of the AFM tip with coupled plasmon-phonon modes with a small penetration depth. The model allows us to quantitatively correlate changes in the optical signal with the variation of the 2DES transport properties induced by cooling and by electrostatic gating. To probe the spatial resolution of the technique, we image conducting nano-channels written in insulating heterostructures with a voltage-biased tip of an atomic force microscope.

Length scales of interfacial coupling between metal and insulator phases in oxides

Author Dominguez Ordonez, Claribel; Georgescu, Alexandre B.; Mundet, Bernat; Zhang, Yajun; Fowlie, Jennifer; Mercy, Alain; Waelchli, Adrien; Catalano, Sara; Duncan, Alexander; Ghosez, Philippe; Georges, Antoine; Millis, Andrew J.; Gibert, Marta; Triscone, Jean-Marc
Publication date 10.08.2020
Persistent Identifier (PID) 10.26037/yareta:ese7b2ms6vbf3despucbkrlzla
Repository Yareta
Abstract
Controlling phase transitions in transition metal oxides remains a central feature of both technological and fundamental scientific relevance. A well-known example is the metal-insulator transition, which has been shown to be highly controllable. However, the length scale over which these phases can be established is not yet well understood. To gain insight into this issue, we atomically engineered an artificially phase-separated system through fabricating epitaxial superlattices that consist of SmNiO3 and NdNiO3, two materials that undergo a metal-to-insulator transition at different temperatures. We demonstrate that the length scale of the interfacial coupling between metal and insulator phases is determined by balancing the energy cost of the boundary between a metal and an insulator and the bulk phase energies. Notably, we show that the length scale of this effect exceeds that of the physical coupling of structural motifs, which introduces a new framework for interface-engineering properties at temperatures against the bulk energetics.

Probing photoinduced rearrangements in the NdNiO3 magnetic spiral with polarization-sensitive ultrafast resonant soft x-ray scattering

Author Beyerlein, K. R.; Disa, A. S.; Först, M.; Henstridge, M.; Gebert, T.; Forrest, T.; Fitzpatrick, A.; Dominguez, C.; Fowlie, J.; Gibert, M.; Triscone, J. M.; Dhesi, S. S.; Cavalleri, A.
Publication date 11.12.2020
Persistent Identifier (PID) 10.26037/yareta:jlgb332yujdltoujpg4no76ubm
Repository Yareta
Abstract
We use resonant soft x-ray diffraction to track the photoinduced dynamics of the antiferromagnetic structure in a NdNiO3 thin film. Femtosecond laser pulses with a photon energy of 0.61 eV, resonant with electron transfer between long-bond and short-bond nickel sites, are used to excite the material and drive an ultrafast insulator-metal transition. Polarization-sensitive soft x-ray diffraction, resonant to the nickel L3 edge, then probes the evolution of the underlying magnetic spiral as a function of time delay with 80 ps time resolution. By modeling the azimuthal dependence of the scattered intensity for different linear x-ray polarizations, we benchmark the changes of the local magnetic moments and the spin alignment. The measured changes are consistent with a reduction of the long-bond site magnetic moments and an alignment of the spins towards a more collinear structure at early time delays.

Crossover between distinct symmetries in solid solutions of rare earth nickelates

Author Fowlie, Jennifer; Mundet, Bernat; Toulouse, Constance; Schober, Alexander; Guennou, Mael; Dominguez, Claribel; Gibert, Marta; Alexander, Duncan T.L.; Kreisel, Jens; Triscone, Jean-Marc
Publication date 14.07.2021
Persistent Identifier (PID) 10.26037/yareta:oonzm7k6kfcajgiihcffkxjhci
Repository Yareta
Abstract
A strong coupling of the lattice to functional properties is observed in many transition metal oxide systems such as the ABO3 perovskites. In the quest for tailor-made materials it is essential to be able to control the structural properties of the compound(s) of interest. Here, thin film solid solutions that combine NdNiO3 and LaNiO3, two materials with perovskite structure but distinct space-groups, are analyzed. Raman spectroscopy and scanning transmission electron microscopy are combined in a synergistic approach to fully determine the mechanism of the structural crossover with chemical composition. It is found that the symmetry transition is achieved by phase coexistence in a way that depends upon the substrate selected. These results carry implications for analog-tuning of physical properties in future functional materials based on these compounds.

Electronic transport in submicrometric channels at the LaAlO3/SrTiO3 interface

Author Boselli, Margherita; Scheerer, Gernot; Filippone, Michele; Luo, Weiwei; Waelchli, Adrien; Kuzmenko, Alexey B.; Gariglio, Stefano; Giamarchi, Thierry; Triscone, Jean-Marc
Publication date 03.11.2021
Persistent Identifier (PID) 10.26037/yareta:dzd6qdlcyfhjjokfd7ldj5fpya
Repository Yareta


Near-atomic-scale mapping of electronic phases in rare earth nickelate superlattices

Author Mundet, Bernat; Dominguez, Claribel; Fowlie, Jennifer; Gibert, Marta; Triscone, Jean-Marc; Alexander, Duncan T.L.
Publication date 08.03.2021
Persistent Identifier (PID) 10.26037/yareta:b5gpx2lvzjdpjo5pc7upmp3bjy
Repository Yareta
Abstract
Nanoscale mapping of the distinct electronic phases characterizing the metal-insulator transition displayed by most of the rare-earth nickelate compounds is fundamental for discovering the true nature of this transition and the possible couplings that are established at the interfaces of nickelate-based heterostructures. Here, we demonstrate that this can be accomplished by using scanning transmission electron microscopy in combination with electron energy-loss spectroscopy. By tracking how the O K and Ni L edge fine structures evolve across two different NdNiO3/SmNiO3 superlattices, displaying either one or two metal-insulator transitions depending on the individual layer thickness, we are able to determine the electronic state of each of the individual constituent materials. We further map the spatial configuration associated with their metallic/insulating regions, reaching unit cell spatial resolution. With this, we estimate the width of the metallic/insulating boundaries at the NdNiO3/SmNiO3 interfaces, which is measured to be on the order of four unit cells.

Scale-invariant magnetic textures in the strongly correlated oxide NdNiO3

Author Li, Jiarui; Pelliciari, Jonathan; Mazzoli, Claudio; Catalano, Sara; Simmons, Forrest; Sadowski, Jerzy T.; Levitan, Abraham; Gibert, Marta; Wikins, Stuart; Carlson, Erica; Triscone, Jean-Marc; Comin, Riccardo
Publication date 15.10.2019
Persistent Identifier (PID) 10.26037/yareta:acqfapvmkrflzaz2xdzik56kgi
Repository Yareta
Abstract
Strongly correlated quantum solids are characterized by an inherently granular electronic fabric, with spatial patterns that can span multiple length scales in proximity to a critical point. Here, we use a resonant magnetic X-ray scattering nanoprobe with sub-100 nm spatial resolution to directly visualize the texture of antiferromagnetic domains in NdNiO3. Surprisingly, our measurements reveal a highly textured magnetic fabric, which we show to be robust and nonvolatile even after thermal erasure across its ordering temperature. The scalefree distribution of antiferromagnetic domains and its non-integral dimensionality point to a hitherto-unobserved magnetic fractal geometry in this system. These scale-invariant textures directly reflect the continuous nature of the magnetic transition and the proximity of this system to a critical point. The present study not only exposes the near-critical behavior in rare earth nickelates but also underscores the potential for X-ray scattering nanoprobes to image the multiscale signatures of criticality near a critical point.

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
American Physical Society, March Meeting 2022 Talk given at a conference Electronic coupling in nickelate-basedsuperlattices 13.03.2022 Chicago, Illinois, USA, United States of America Mundet Bolos Bernat;
MRS Fall Meeting 2021 Talk given at a conference Coupling of metal-insulator and magnetic phases at nickelate interfaces 06.12.2021 Boston (but online contribution), United States of America Triscone Jean-Marc;
LQSS Talk given at a conference Artificial quantum materials made of transition metal oxides 15.11.2021 Geneva (UNIGE) and Lausanne (EPFL), Switzerland Triscone Jean-Marc;
MaNEP Mini-Workshop on Complex Oxide Heterostructures Poster Growth and Oxygenation of Infinite-Layer CaCuO2 and SrCuO2 Thin Films 28.10.2021 Online, Switzerland Waelchli Adrien;
International Workshop on Oxide Electronics (iWOE27) Talk given at a conference Structural and electronic phase mapping in Rare-earth Nickelate heterostructures 13.10.2021 Genova, Italy Mundet Bolos Bernat;
International Workshop on Oxide Electronics (iWOE27) Poster Controlling the order parameter coupling in nickelates based superlattices 13.10.2021 Genova, Italy Varbaro Lucia;
International Workshop on Oxide Electronics (iWOE27) Talk given at a conference Coupling of Magnetic Phases at Nickelates Interfaces 13.10.2021 Genova, Italy Dominguez Ordonez Claribel;
International Workshop on Oxide Electronics (iWOE27) Poster Growth and Oxygenation of Infinite-Layer CaCuO2 and SrCuO2 Thin Films (online participation) 13.10.2021 Genova, Italy Waelchli Adrien;
Quantum Matter Agora Talk given at a conference Structural and electronic couplings in rare-earth nickelate superlattices 30.08.2021 Les Diablerets, Switzerland Mundet Bolos Bernat;
Quantum Matter Agora Poster Growth and Oxygenation of Infinite-Layer CaCuO2 and SrCuO2 Thin Films 30.08.2021 Les Diablerets, Switzerland Waelchli Adrien;
Quantum Oxide Research Online Meeting - 4 (QUOROM-4) Talk given at a conference Extracting atomic-scale information from rare-earth nickelate superlattices 24.06.2021 Queen’s University of Belfast, UK (Online), Great Britain and Northern Ireland Mundet Bolos Bernat;
Condensed matter department seminar in the University of Zurich (UZH) Individual talk Using STEM-EELS as a Swiss Knife Tool to Extract Atomic-Scale Information from Rare-Earth Nickelate Heterostructures 05.05.2021 Online, Switzerland Mundet Bolos Bernat;
American Physical Society, March Meeting 2021 Talk given at a conference Thickness-dependent perovskite octahedral distortions at heterointerfaces (invited talk given by Jennifer Fowlie, who did participate to the project and was paid by the university) 15.03.2021 Online, United States of America Triscone Jean-Marc;
American Physical Society, March Meeting 2021 Talk given at a conference Length scales of interfacial coupling between metal and insulator phases in oxides 15.03.2021 Online, United States of America Dominguez Ordonez Claribel;
American Physical Society, March Meeting 2021 Talk given at a conference Mapping electronic phase coexistence in nickelate superlattices by STEM-EELS 15.03.2021 Online, United States of America Mundet Bolos Bernat;
Quantum Oxide Research Online Meeting - 3 (QUOROM-3) Poster Growth and Oxygenation of Infinite-Layer CaCuO2 and SrCuO2 Thin Films 11.02.2021 Online, Switzerland Waelchli Adrien;
Quantum Oxide Research Online Meeting - 3 (QUOROM-3) Poster Length scales of interfacial coupling between metal and insulator phases in oxides 11.02.2021 Online, Switzerland Dominguez Ordonez Claribel;
Quantum Oxide Research Online Meeting - 3 (QUOROM-3) Poster Mapping electronic phase coexistence in nickelate superlattices by STEM-EELS 11.02.2021 Online, Switzerland Mundet Bolos Bernat;
Electronic Materials and Applications 2021 Talk given at a conference Mapping electronic phases in nickelate superlattices by STEM-EELS 19.01.2021 Online, United States of America Mundet Bolos Bernat;
American Ceramic Society, Electronic Materials and Applications Talk given at a conference Symmetry crossover in rare earth nickelate solid solutions (contributed talk given by Jennifer Fowlie, who did participate to the project and was paid by the university) 19.01.2021 Online, United States of America Triscone Jean-Marc;
2nd Quantum Oxide Research Online Meeting 2020 Poster Crossover of distinct symmetries in rare earth nickelates (poster presented by Jennifer Fowlie, who did participate to the project and was paid by the university) 12.11.2020 Zurich, Switzerland Triscone Jean-Marc;
CMD2020GEFES 2020 joint conference of the condensed matter divisions of European and Spanish condensed matter division (online) Talk given at a conference Mapping metallic and insulating regions in rare-earth nickelate superlattices using monochromated electron energy-loss spectroscopy 31.08.2020 Madrid, Spain Mundet Bolos Bernat;
Les Houches Summer School 2020 (online) Talk given at a conference Perovskite nickelates and heterostructuring (lecture given by Jennifer Fowlie, who did participate to the project and was paid by the university) 06.07.2020 Les Houches, France Triscone Jean-Marc;
1st Quantum Oxide Research Online Meeting 2020 (online) Talk given at a conference Combining distinct rare earth nick elates - Part I: Solid solutions (invited talk given by Jennifer Fowlie, who did participate to the project and was paid by the university) 28.05.2020 Paris, France Triscone Jean-Marc;
1st Quantum Oxide Research Online Meeting 2020 (online) Talk given at a conference Combining distinct rare earth nick elates - Part I: Superlattices 28.05.2020 Paris, France Dominguez Ordonez Claribel;
Ted@100 Birthday Conference Talk given at a conference Properties of nickelate based solid solutions close to TMI=0K 21.01.2020 Standford, USA, United States of America Triscone Jean-Marc;
MRS Fall Meeting 2019 Poster Engineering Electronic Coupling of Metal-Insulator Phases at SmNiO3/NdNiO3 Interfaces 01.12.2019 Boston Massachusetts, United States of America Dominguez Ordonez Claribel;
Workshop on Carrier Doping in two-dimensional Layered Materials: toward novel physical properties and electronic device applications 2019 Talk given at a conference Variable-temperature infrared microscopy of conducting oxide interfaces (invited talk given by Stefano Gariglio, who did participate to the project and was paid by the university) 04.11.2019 Naples, Italy Triscone Jean-Marc;
Workshop on Transition Metal Oxide Physics 2019 Talk given at a conference Quantum tuning of superconductivity in strontium titanate and in the 2DES of LAO/STO (talk given by Gernot Scheerer, who did participate to the project and was paid by the university) 16.10.2019 Stresa, Italy Triscone Jean-Marc;
26th International Workshop on Oxide Electronics (iWOE26) 2019 Poster Study of the interface between infinite-layer CaCuO2 and perovskite SrTiO3 29.09.2019 Kyoto University, Kyoto, Japan Waelchli Adrien;
26th International Workshop on Oxide Electronics (iWOE26) 2019 Poster Growth and characterisation of infinite-layer SrCuO2 thin films (poster presented by Marios Hadjimichael, who did participate to the project and was paid by the university) 29.09.2019 Kyoto University, Kyoto, Japan Triscone Jean-Marc;
26th International Workshop on Oxide Electronics (iWOE26) 2019 Poster Insights into the structural properties of NdNiO3/ SmNiO3 superlattices 29.09.2019 Kyoto University, Kyoto, Japan Mundet Bolos Bernat;
26th International Workshop on Oxide Electronics (iWOE26) 2019 Poster Engineering Electronic Coupling of Metal-Insulator Phases at SmNiO3/NdNiO3 Interfaces 29.09.2019 Kyoto University, Kyoto, Japan Dominguez Ordonez Claribel;
26th International Workshop on Oxide Electronics (iWOE26) 2019 Talk given at a conference Imaging of the LaAlO3/SrTiO3 interface using the scanning near-field optical microscopy technique (talk given by Margherita Boselli, who did participate to the project and was paid by the university) 29.09.2019 Kyoto University, Kyoto, Japan Triscone Jean-Marc;
26th International Workshop on Oxide Electronics (iWOE26) 2019 Talk given at a conference Combining distinct rare earth nickelates in solid solutions and superlattices (invited talk given by Jennifer Fowlie, who did participate to the project and was paid by the university) 29.09.2019 Kyoto University, Kyoto, Japan Triscone Jean-Marc;
Correlation Days 2019 Talk given at a conference Structural and electronic coupling at oxide interfaces 16.09.2019 Max Planck Institute for the Physics of Complex Systems, Dresden, Germany Triscone Jean-Marc;
Swiss Physical Society Annual Meeting 2019 Talk given at a conference Transport in sub-micrometric devices at the LaAlO3/SrTiO3 interface (talk given by Margherita Boselli, who did participate to the project and was paid by the university) 25.08.2019 University of Zurich, Switzerland Triscone Jean-Marc;
Joint IEEE ISAF/ICE/EMF/IWPM/PFM Conference 2019 Talk given at a conference Structural and electronic coupling at oxide interfaces 14.07.2019 Lausanne, Switzerland Triscone Jean-Marc;
Quantum cavities and excitonic Insulators workshop Talk given at a conference An approach to phonon engineering motivated by transition metal oxides (contributed talk given by Jennifer Fowlie, who did participate to the project and was paid by the university) 09.07.2019 CCQ, Flatiron Institute, New York City, USA, United States of America Triscone Jean-Marc;
Congrès Général de la Société Française de Physique 2019 Talk given at a conference La physique des interfaces entre oxydes 08.07.2019 Nantes, France Triscone Jean-Marc;
International School of Oxide Electronics 2019 (ISEO19) Individual talk Study of the interface between infinite-layer CaCuO2 and perovskite SrTiO3 25.06.2019 Institut d’Etudes Scientifiques de Cargèse, Corsica, France Waelchli Adrien;
CEMS symposium on emergent quantum materials 2019 Talk given at a conference Possible metastable states in rare earth nickelates: understanding the phase diagram of Nd1-xLaxNiO3 (talk given by Jennifer Fowlie, who did participate to the project and was paid by the university) 22.05.2019 Tokyo University, Tokyo, Japan Triscone Jean-Marc;
CEMS symposium on emergent quantum materials 2019 Talk given at a conference Electronic coupling of metal-insulator phases at oxide interfaces 22.05.2019 Tokyo University, Tokyo, Japan Triscone Jean-Marc;
Recent developments in oxide electronics: from 2DEGs to neuromorphic functionalities and beyond (Informal workshop) 2019 Talk given at a conference Near-field optical imaging of LaAlO3/SrTiO3 interfaces (talk given by Margherita Boselli, who did participate to the project and was paid by the university) 02.04.2019 Laboratoire de Physique des Solides, Orsay, France Triscone Jean-Marc;
APS March Meeting 2019 Talk given at a conference Study of infinite layer SrTiO3/CaCuO2 interfaces 04.03.2019 Boston Convention Center, Boston, United States of America Waelchli Adrien;
Q-MAC Meeting 2019 Talk given at a conference Probing the role of apical oxygens in cuprates using a CaCuO2/SrTiO3 bilayer structure 24.02.2019 Fondation Hugot, Paris, France Waelchli Adrien;
7th SKKU Workshop 2019 Talk given at a conference Structural and electronic properties of nickelate heterostructures 21.01.2019 Seoul, Korean Republic (South Korea) Triscone Jean-Marc;
Workshop on Transition Metal Oxide Physics 2018 Talk given at a conference Interplay of ferroelectricity, quantum criticality, and superconductivity in SrTiO3 (talk given by Gernot Scheerer, who did participate to the project and was paid by the university) 24.10.2018 Santa Margherita, Italy Triscone Jean-Marc;
International Workshop on Oxide Electronics 25 2018 Poster Electronic transport in low dimensions: conducting nanowires at the LaAlO3/SrTiO3 interface (poster presented by Margherita Boselli, who did participate to the project and was paid by the university) 30.09.2018 Les Diablerets, Switzerland Triscone Jean-Marc;
International Workshop on Oxide Electronics 25 2018 Poster Exploring the phase diagram of Nd1-xLaxNiO3 thin films (poster presented by Jennifer Fowlie, who did participate to the project and was paid by the university) 30.09.2018 Les Diablerets, Switzerland Triscone Jean-Marc;
International Workshop on Oxide Electronics 25 2018 Poster Confinement of the 2DEL at the LaAlO3/SrTiO3 interface 30.09.2018 Les Diablerets, Switzerland Waelchli Adrien;
EMRS Fall Meeting 2018 Talk given at a conference Superconducting properties of SrTiO3-based polar interfaces (talk given by Stefano Gariglio, who did participate to the project and was paid by the university) 17.09.2018 Warsaw, Poland Triscone Jean-Marc;
Joint European Magnetic Symposia 2018 Talk given at a conference Magnetic properties of nickelate films and nickelate based heterostructures 03.09.2018 Mainz, Germany Triscone Jean-Marc;
M2S-2018 Talk given at a conference Superconductivity at the LaAlO3/SrTiO3 interface and related systems 19.08.2018 Beijing, China Triscone Jean-Marc;
Workshop on Correlated electron systems – novel developments 2018 Talk given at a conference Confinement and superconductivity at the LaAlO3/SrTiO3 interface and related systems 16.05.2018 Minneapolis, United States of America Triscone Jean-Marc;
Swiss-Sino joint workshop 2018 Talk given at a conference Magnetic properties of nickelate films and nickelate based heterostructures 08.05.2018 PSI, Switzerland Triscone Jean-Marc;


Self-organised

Title Date Place

Associated projects

Number Title Start Funding scheme
165716 Electronic properties of nickelate oxide thin films and artificial heterostructures 01.04.2016 Project funding
205279 Complex Nano-structures based on 2D Materials 01.02.2022 R'EQUIP
207338 Structural and electronic coupling at oxide interfaces 01.04.2022 Project funding
183300 High-resolution soft-X-ray ARPES facility at Swiss Light Source 01.03.2019 R'EQUIP
154410 Interface effects and coupled order parameters in complex oxide multilayers 01.11.2014 Sinergia
165745 Propriétés électroniques de systèmes à basses dimensions 01.04.2016 Project funding

Abstract

The research project proposed here is a continuation of project 200020_165745 “Electronic properties of low dimensional systems” and project 200020_165716 “Electronic properties of nickelate oxide films and heterostructures”. More specifically, project 200020_165745 was a project with an experimental and a theoretical part (Prof. Thierry Giamarchi was a co-applicant). Here the continuation concerns the experimental part on “Conducting oxide interfaces”.The project described here has three main parts: Part 1 deals with studies of the interface between the two good band insulators LaAlO3 and SrTiO3 that was found to be conducting, superconducting and to display a strong spin-orbit interaction. The project proposes to specifically investigate: -The spin-orbit, weak localization and weak anti-localization through transport measurements in nanowires as a function of their width and carrier density (that is controlled by electric field effect); -The superconducting phase diagram of the system, possible inhomogeneities in the underdoped region, and the possible role of ferroelectric fluctuations on superconductivity;-Junctions to probe the superconducting order parameter and structures allowing the possible topological nature of the system to be revealed.Part 2 proposes to use nickelate structures to investigate how structural distortions (oxygen octahedra tilts) can be controlled / induced across interfaces and how these distortions affect the metal-insulator transition observed in these systems. The project will use transport measurements, transmission electron microscopy studies, and Density Functional Theory calculations to:-Study the metal-insulator transition in solid solution thin films for which the metal-insulator transition temperature (TMI) is close to T=0K. There, we expect the sensitivity of the system to distortions to be amplified. -Study the metal-insulator transitions in superlattices made of NdNiO3 and SmNiO3 - the two materials having very different TMI’s. The coupling or decoupling of the distortions in individual layers should lead to a single or a double metal to insulator transitions: their observation will provide information on how distortions propagate across interfaces and will help us better understand the role of distortions on the metal to insulator transition as well as on the antiferromagnetic order in these artificial systems.Part 3 proposes to develop and use oxide molecular beam epitaxy (MBE) to explore layered oxide systems. Of particular interest will be Ruddlesden-Popper phases.
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