Project

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Magnetic and electric ordering and dynamics studied by soft x-rays

Applicant Staub Urs
Number 169017
Funding scheme Project funding (Div. I-III)
Research institution Synchrotron Lichtquelle Schweiz Paul Scherrer Institut
Institution of higher education Paul Scherrer Institute - PSI
Main discipline Condensed Matter Physics
Start/End 01.04.2017 - 31.03.2021
Approved amount 429'462.00
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Keywords (3)

soft x-rays; ultrafast dynamics; electronic ordering phenomena

Lay Summary (German)

Lead
Urs Staub
Lay summary
Dieses Forschungsgesuch untersucht elektronische und magnetische Ordungsphänomene an Oberflächen. Die untersuchten Materialien sind Oxide, die magnetische Ionen enthalten und durch die Kopplung der Elektronen und deren Spins zu interessanten magnetischen und elektronischen Ordnungen führen. Diese werden mit Hilfe von Synchrotron X-Ray Strahlung untersucht, die diese Art von Ordnungen direkt bestimmen können. Die Herausfordung in diesem Projekt ist die Erweiterung zu Ordnungen an Oberflächen und die Studie von ultra schnellen Prozessen dieser Ordungsphänomene (in der femtosekunden Zeitskala). Daher hat dieses Projekt zwei Schwerpunkte: Der eine ist auf die Methoden ausgerichtet, d.h. die Sensitivität mit X-Ray diese Phänomena auf ultra dünne Schichten (Oberfläche) auszudehnen und mit ultrakurzen Laserpulsen anzuregen um deren Dynamik zu studieren. Beides beinhaltet technische und methodische Entwicklungsarbeit. Der zweite Fokus liegt im Verstehen dieser Ordungsphänomene und deren ultraschnellen Dynamik. Dies beinhaltet Materialien die nur als dünne Schichten stabil sind, und so nicht in der Nature vorkommen, jedoch interessante Eigenschaften für Anwendungen haben können.
 
Direct link to Lay Summary Last update: 08.03.2017

Responsible applicant and co-applicants

Employees

Publications

Publication
Correlation between electronic and structural orders in 1T−TiSe2
Ueda Hiroki, Porer Michael, Mardegan José R. L., Parchenko Sergii, Gurung Namrata, Fabrizi Federica, Ramakrishnan Mahesh, Boie Larissa, Neugebauer Martin Josef, Burganov Bulat, Burian Max, Johnson Steven Lee, Rossnagel Kai, Staub Urs (2021), Correlation between electronic and structural orders in 1T−TiSe2, in Physical Review Research, 3(2), L022003-L022003.
Buried moiré supercells through SrTiO3 nanolayer relaxation
Burian Max, Pedrini Bill Francesco, Ortiz Hernandez Nazaret, Ueda Hiroki, Vaz C. A. F., Caputo Marco, Radovic Milan, Staub Urs (2021), Buried moiré supercells through SrTiO3 nanolayer relaxation, in Physical Review Research, 3(1), 013225-013225.
Magnetic field dependent cycloidal rotation in pristine and Ge-doped CoCr2O4
Ortiz Hernández N., Parchenko S., Mardegan J. R. L., Porer M., Schierle E., Weschke E., Ramakrishnan M., Radovic M., Heuver J. A., Noheda B., Daffé N., Dreiser J., Ueda H., Staub U. (2021), Magnetic field dependent cycloidal rotation in pristine and Ge-doped CoCr2O4, in Physical Review B, 103(8), 085123-085123.
Structural involvement in the melting of the charge density wave in 1T−TiSe2
Burian Max, Porer Michael, Mardegan Jose R. L., Esposito Vincent, Parchenko Sergii, Burganov Bulat, Gurung Namrata, Ramakrishnan Mahesh, Scagnoli Valerio, Ueda Hiroki, Francoual Sonia, Fabrizi Federica, Tanaka Yoshikazu, Togashi Tadashi, Kubota Yuya, Yabashi Makina, Rossnagel Kai, Johnson Steven L., Staub Urs (2021), Structural involvement in the melting of the charge density wave in 1T−TiSe2, in Physical Review Research, 3(1), 013128-013128.
Magnetic and electronic properties at the γ−Al2O3/SrTiO3 interface
Mardegan J. R. L., Christensen D. V., Chen Y. Z., Parchenko S., Avula S. R. V., Ortiz-Hernandez N., Decker M., Piamonteze C., Pryds N., Staub U. (2019), Magnetic and electronic properties at the γ−Al2O3/SrTiO3 interface, in Physical Review B, 99(13), 134423-134423.

Datasets

Raw and derived data set from the study: Magnetic field dependent cycloidal rotation in pristine and Ge-doped CoCr2O4

Author staub, Urs
Persistent Identifier (PID) 10.16907/c15020ae-6c45-41ba-9131-d0ff87bd7010
Repository SciCat


Structural involvement in the melting of the charge density wave in 1T-TiSe2

Author Burian, Max
Persistent Identifier (PID) 10.24435/materialscloud:b3-e5
Repository Materials Cloude Archive


Correlation between electronic and structural orders in 1T-TiSe2

Author Staub, Urs
Persistent Identifier (PID) https://doi.org/10.24435/materialscloud:60-01
Repository Materials Cloude Archive


Collaboration

Group / person Country
Types of collaboration
FEMTOSPEC team BESSYII HZB Berlin Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Research Infrastructure
V. Scagnoli (L. Heydermann) PSI (ETH) Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Bernina team/SwissFEL PSI Switzerland (Europe)
- Publication
- Research Infrastructure
S. Lovesey, Diamond Light Source Diamond House Oxfordshore OX11 0QX Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Beatriz Noheda Netherlands (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
S. L. Johnson, ETHZ Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Kollokium Max Born Institute Individual talk Ultrafast lattice, electron and spin dynamics through coherent “soft mode driving” 16.12.2020 Berlin on-line, Germany Staub Urs;
Science@FEL2020 Talk given at a conference Ultrafast electron localization in a correlated metal 14.09.2020 Hamburg, Germany Staub Urs;
Gordon Research Conference on Ultrafast Phenomena in Cooperative Systems Poster Structural assisted exciton melting in 1T-TiSe2 02.02.2020 Lucca, Italy Burian Max;
Gordon Research Conference on Ultrafast Phenomena in Cooperative Systems Poster Ultrafast electron localization in a correlated metal 02.02.2020 Lucca, Italy Staub Urs;
Joint European Magnetic Symposia (JEMS) Poster The polar distortion and its relation to magnetic order in multiferroic HoMnO3, 26.08.2019 Uppsala, Sweden Ortiz-Hernandez Nazaret;
Paris Ultrafast 2019 Talk given at a conference Ultrafast charge localization in a valence fluctuating intermetallic 04.06.2019 Paris, France Staub Urs;
Deutsche Physikaalische Fruehjahrstagung Talk given at a conference The polar distortion and its relation to magnetic order in multiferroic HoMnO3 31.03.2019 Regensburg, Germany Ortiz-Hernandez Nazaret;
Kollokium Oxford Individual talk Ultrafast electron and crystal-structure dynamics in condensed matter 07.02.2019 Oxford, Great Britain and Northern Ireland Staub Urs;
Seminar Univ. Muenchen Individual talk Ultrafast dynamics in condensed matter: 26.11.2018 Muenchen, Germany Staub Urs;
Synchrotron Radiation School and Magnetims Poster Magnetoelectric correlation in multiferroic CoCr2O4 andGe doped CoCr2O4 07.10.2018 Mittelwhir, France Ortiz-Hernandez Nazaret;
Swiss Workshop on Materials with Novel Electronic Properties Poster Inducing a non-collinear magnetic phase in multiferroic Ge doped 2-7 CoCr2O4 29.08.2018 Les Diablarets, Switzerland Ortiz-Hernandez Nazaret;


Associated projects

Number Title Start Funding scheme
196964 Spin lattice and electron lattice interactions in correlated quantum materials 01.07.2021 Project funding (Div. I-III)
189640 High-energy resolution spectrometer for SASE broadband Time-Resolved RIXS at Furka endstation 01.03.2021 R'EQUIP

Abstract

Our scientific objective is the investigation of electronic and magnetic ordering phenomena in strongly correlated electron systems. In recent years we have developed and strengthened our core expertise of resonant x-ray scattering, which allows us to study ordering phenomena in reciprocal space. We study charge and orbital ordered systems that exhibit metal-insulator “type” transitions and where magnetic order is directly connected to the occurrence of ferroelectric polarization (multiferroics). Experimentally, we have been limited to investigate ordering phenomena for which the ordering wave vector points sufficiently out of the surface. This limit is caused by the resonant edges used in the soft x-ray scattering experiments, allowing often only accessing the first superlattice reflection. The main idea of this proposal is to significantly extend our resonant soft x-ray diffraction capabilities in two parallel and complimentary lines of work. The study of in-plane ordering phenomena in layered materials, (ultra) thin films and eventually even surface effects for example in topological insulators and the study of ultrafast dynamics of magnetic systems. One part of the project is dedicated to develop the experimental technique and extend our existing experimental setup to study in-plane order that occurs in three important types of materials: ultrathin films, two-dimensional long-range magnetic orderings such as skyrmion lattices and exotic chiral ordering phenomena which are responsible for magnetoelectric coupling, e.g. in BiFeO3.The other part of the project is dedicated to the investigation of dynamic and transient states of such magnetically ordered systems. This includes demagnetization and optical-switching dynamics. Studying these phenomena on ultrafast time-scales will provide insight into the underlying interaction between two ferromagnetic sublattices and the competing interactions that lead to complex magnetic order. As a common starting material for both subprojects we have identified insulating spinels like CoCr2O4, which can exhibit in and out of plane magnetic order depending on strain. We have very recently shown that ultrafast magnetization switching occurs when exciting CoCr2O4 with an optical femtosecond laser pulse. Expanding these results to ferrimagnetic insulators with orderings occurring at ambient conditions will be important for possible device application studies.In addition, both projects will contribute towards the common goal which is the development of experimental techniques that will be applicable and strongly profit from the SwissFEL ATHOS soft x-ray branch which will be built after the startup of the hard x-ray branch ARAMIS in 2017. The experience and advances gained in the proposed project will have significant impact on the design and optimization of a corresponding experimental station for ATHOS.
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