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Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials

English title Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials
Applicant Ronnow Henrik M.
Number 141962
Funding scheme Sinergia
Research institution Laboratoire de magnétisme quantique EPFL - SB - IPMC - LQM
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.01.2013 - 31.12.2015
Approved amount 1'800'000.00
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All Disciplines (2)

Discipline
Condensed Matter Physics
Theoretical Physics

Keywords (5)

iridates; Heisenberg model; Metal insulator transition; Mott physics; Hubbard model

Lay Summary (English)

Lead
Lay summary
The Mott Insulating state is one of the most fundamental consequences of strong electron interaction in concert with quantum mechanics. In its simplest form, it projects the low energy sector onto a magnetic Heisenberg model, which has played a central role over the past sixty years of unveiling the magnetic properties of Mott insulators. However, it has become increasingly clear that new quantum phases of matter can occur in cases where the Heisenberg approximation is not sufficient. This Sinergia proposal aims to unite leading groups in their respective domains of material synthesis, experiments and theory for a focused coherent effort to study new materials beyond the Heisenberg approximation. Specifically, we shall investigate: i) the presence of orbital degeneracy, where an extra local degree of freedom has to be taken into account, ii) the proximity to the metal-insulator transition, where more complicated spin-spin interactions become significant, or iii) systems like iridates, where the effective local spin-1/2 degree of freedom may lead to strongly anisotropic interactions. The initial thrust will be on investigations of iridium-oxides – an emerging material class which has recently attracted considerable attention world-wide.
Direct link to Lay Summary Last update: 21.02.2013

Responsible applicant and co-applicants

Employees

Publications

Publication
Correlation of the superconducting critical temperature with spin and orbital excitations in (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy as measured by resonant inelastic x-ray scattering
Ellis David Shai, Huang Yao-Bo, Olalde-Velasco Paul, Dantz Marcus, Pelliciari Jonathan, Drachuck Gil, Ofer Rinat, Bazalitsky Galina, Berger Jorge, Schmitt Thorsten, Keren Amit (2015), Correlation of the superconducting critical temperature with spin and orbital excitations in (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy as measured by resonant inelastic x-ray scattering, in PHYSICAL REVIEW B, 92(10), 104507.
Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14
Yang Lin, Pisoni Andrea, Magrez Arnaud, Katrych Sergiy, Arakcheeva Alla, Dalla Piazza Bastien, Prsa Krunoslav, Jacimovic Jacim, Akrap Ana, Teyssier Jeremie, Forro Laszlo, Ronnow Henrik M. (2015), Crystal Structure, Transport, and Magnetic Properties of an Ir6+ Compound Ba8Al2IrO14, in INORGANIC CHEMISTRY, 54(9), 4371-4376.
Evidence of quantum dimer excitations in Sr3Ir2O7
Sala M. Moretti, Schnells V., Boseggia S., Simonelli L., Al-Zein A., Vale J. G., Paolasini L., Hunter E. C., Perry R. S., Prabhakaran D., Boothroyd A. T., Krisch M., Monaco G., Ronnow H. M., McMorrow D. F., Mila F. (2015), Evidence of quantum dimer excitations in Sr3Ir2O7, in PHYSICAL REVIEW B, 92(2), 024405.
Importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments
Vale J. G., Boseggia S., Walker H. C., Springell R., Feng Z., Hunter E. C., Perry R. S., Prabhakaran D., Boothroyd A. T., Collins S. P., Ronnow H. M., McMorrow D. F. (2015), Importance of XY anisotropy in Sr2IrO4 revealed by magnetic critical scattering experiments, in PHYSICAL REVIEW B, 92(2), 020406.
Intrachain antiferromagnetic exchange in a 1D branched-chain built of two different copper(II) centres interlinked by end-on azido and phenoxo bridges: electron density map, electrochemical and magnetic properties
Fadaee Farzaneh, Amirnasr Mehdi, Prsa Krunoslav, Pattison Philip, Shaik Noore Elahi, Ronnow Henrik M., Esrafili Mehdi D., Omrani Arash A., Amiri Ahmad, Schenk-Joss Kurt (2015), Intrachain antiferromagnetic exchange in a 1D branched-chain built of two different copper(II) centres interlinked by end-on azido and phenoxo bridges: electron density map, electrochemical and magnetic properties, in RSC ADVANCES, 5(74), 59926-59934.
Magnetic model in multiferroic NdFe3(BO3)(4) investigated by inelastic neutron scattering
Hayashida S., Soda M., Itoh S., Yokoo T., Ohgushi K., Kawana D., Ronnow H. M., Masuda T. (2015), Magnetic model in multiferroic NdFe3(BO3)(4) investigated by inelastic neutron scattering, in PHYSICAL REVIEW B, 92(5), 054402.
Magnons in tetragonal CuO
Moser S., Shaik N. E., Samal D., Fatale S., Dalla Piazza B., Dantz M., Pelliciari J., Olalde-Velasco P., Schmitt T., Koster G., Mila F., Ronnow H. M., Grioni M. (2015), Magnons in tetragonal CuO, in PHYSICAL REVIEW B, 92(14), 140404.
One-dimensional quantum magnetism in the anhydrous alum KTi(SO4)(2)
Nilsen G. J., Araja A., Tsirlin A. A., Mutka H., Kasinathan D., Ritter C., Ronnow H. M. (2015), One-dimensional quantum magnetism in the anhydrous alum KTi(SO4)(2), in NEW JOURNAL OF PHYSICS, 17, 113935.
Orbital control of effective dimensionality: from spin-orbital fractionalization to confinement in the anisotropic ladder system CaCu(2)O(3).
Bisogni Valentina, Wohlfeld Krzysztof, Nishimoto Satoshi, Monney Claude, Trinckauf Jan, Zhou Kejin, Kraus Roberto, Koepernik Klaus, Sekar Chinnathambi, Strocov Vladimir, Büchner Bernd, Schmitt Thorsten, van den Brink Jeroen, Geck Jochen (2015), Orbital control of effective dimensionality: from spin-orbital fractionalization to confinement in the anisotropic ladder system CaCu(2)O(3)., in Physical review letters, 114(9), 096402-096402.
Sc2Ga2CuO7: A possible quantum spin liquid near the percolation threshold
Kumar R., Khuntia P., Sheptyakov D., Freeman P. G., Ronnow H. M., Koteswararao B., Baenitz M., Jeong M., Mahajan A. V. (2015), Sc2Ga2CuO7: A possible quantum spin liquid near the percolation threshold, in PHYSICAL REVIEW B, 92(18), 0411.
Spin-orbit-induced orbital excitations in Sr2RuO4 and Ca2RuO4: A resonant inelastic x-ray scattering study
Fatuzzo C. G., Dantz M., Fatale S., Olalde-Velasco P., Shaik N. E., Piazza B. Dalla, Toth S., Pelliciari J., Fittipaldi R., Vecchione A., Kikugawa N., Brooks J. S., Ronnow H. M., Grioni M., Rueegg Ch., Schmitt T., Chang J. (2015), Spin-orbit-induced orbital excitations in Sr2RuO4 and Ca2RuO4: A resonant inelastic x-ray scattering study, in PHYSICAL REVIEW B, 91(15), 155104.
Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates
Guarise M., Dalla Piazza B., Berger H., Giannini E., Schmitt T., Ronnow H. M., Sawatzky G. A., van den Brink J., Altenfeld D., Eremin I., Grioni M. (2014), Anisotropic softening of magnetic excitations along the nodal direction in superconducting cuprates, in NATURE COMMUNICATIONS, 5, 5760.
Bilayer splitting and wave functions symmetry in Sr3Ir2O7
Moreschini L., Moser S., Ebrahimi A., Dalla Piazza B., Kim K. S., Boseggia S., McMorrow D. F., Ronnow H. M., Chang J., Prabhakaran D., Boothroyd A. T., Rotenberg E., Bostwick A., Grioni M. (2014), Bilayer splitting and wave functions symmetry in Sr3Ir2O7, in PHYSICAL REVIEW B, 89(20), 201114.
Nodal Landau Fermi-liquid quasiparticles in overdoped La1.77Sr0.23CuO4
Fatuzzo C. G., Sassa Y., Mansson M., Pailhes S., Lipscombe O. J., Hayden S. M., Patthey L., Shi M., Grioni M., Ronnow H. M., Mesot J., Tjernberg O., Chang J. (2014), Nodal Landau Fermi-liquid quasiparticles in overdoped La1.77Sr0.23CuO4, in PHYSICAL REVIEW B, 89(20), 205104.
Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4
Piatek J. O., Kovacevic I., Babkevich P., Piazza B. Dalla, Neithardt S., Gavilano J., Kraemer K. W., Ronnow H. M. (2014), Nonequilibrium hysteresis and spin relaxation in the mixed-anisotropy dipolar-coupled spin-glass LiHo0.5Er0.5F4, in PHYSICAL REVIEW B, 90(17), 174427.
Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study
Sala M. Moretti, Rossi M., Boseggia S., Akimitsu J., Brookes N. B., Isobe M., Minola M., Okabe H., Ronnow H. M., Simonelli L., McMorrow D. F., Monaco G. (2014), Orbital occupancies and the putative j(eff)=1/2 ground state in Ba2IrO4: A combined oxygen K-edge XAS and RIXS study, in PHYSICAL REVIEW B, 89(12), 121101.
Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in La2CuO4
Haefliger P. S., Gerber S., Pramod R., Schnells V. I., dalla Piazza B., Chati R., Pomjakushin V., Conder K., Pomjakushina E., Le Dreau L., Christensen N. B., Syljuasen O. F., Normand B., Ronnow H. M. (2014), Quantum and thermal ionic motion, oxygen isotope effect, and superexchange distribution in La2CuO4, in PHYSICAL REVIEW B, 89(8), 085113.
The electronic structure of the high-symmetry perovskite iridate Ba2IrO4
Moser S., Moreschini L., Ebrahimi A., Dalla Piazza B., Isobe M., Okabe H., Akimitsu J., Mazurenko V. V., Kim K. S., Bostwick A., Rotenberg E., Chang J., Ronnow H. M., Grioni M. (2014), The electronic structure of the high-symmetry perovskite iridate Ba2IrO4, in NEW JOURNAL OF PHYSICS, 16, 013008.
Determining the Short-Range Spin Correlations in the Spin-Chain Li2CuO2 and CuGeO3 Compounds Using Resonant Inelastic X-Ray Scattering
Monney Claude, Bisogni Valentina, Zhou Ke-Jin, Kraus Roberto, Strocov Vladimir N., Behr Guenter, Malek Jiri, Kuzian Roman, Drechsler Stefan-Ludwig, Johnston Steve, Revcolevschi Alexandre, Buechner Bernd, Ronnow Henrik M., van den Brink Jeroen, Geck Jochen, Schmitt Thorsten (2013), Determining the Short-Range Spin Correlations in the Spin-Chain Li2CuO2 and CuGeO3 Compounds Using Resonant Inelastic X-Ray Scattering, in PHYSICAL REVIEW LETTERS, 110(8), 087403.
Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chain
Mourigal Martin, Enderle Mechthild, Kloepperpieper Axel, Caux Jean-Sebastien, Stunault Anne, Ronnow Henrik M. (2013), Fractional spinon excitations in the quantum Heisenberg antiferromagnetic chain, in NATURE PHYSICS, 9(7), 435-441.
Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4
Romer A. T., Chang J., Christensen N. B., Andersen B. M., Lefmann K., Maehler L., Gavilano J., Gilardi R., Niedermayer Ch., Ronnow H. M., Schneidewind A., Link P., Oda M., Ido M., Momono N., Mesot J. (2013), Glassy low-energy spin fluctuations and anisotropy gap in La1.88Sr0.12CuO4, in PHYSICAL REVIEW B, 87(14), 144513.
Locking of iridium magnetic moments to the correlated rotation of oxygen octahedra in Sr2IrO4 revealed by x-ray resonant scattering
Boseggia S., Walker H. C., Vale J., Springell R., Feng Z., Perry R. S., Sala M. Moretti, Ronnow H. M., Collins S. P., McMorrow D. F. (2013), Locking of iridium magnetic moments to the correlated rotation of oxygen octahedra in Sr2IrO4 revealed by x-ray resonant scattering, in JOURNAL OF PHYSICS-CONDENSED MATTER, 25(42), 422202.
Low-temperature spin dynamics of a valence bond glass in Ba2YMoO6
de Vries M. A., Piatek J. O., Misek M., Lord J. S., Ronnow H. M., Bos J-W G. (2013), Low-temperature spin dynamics of a valence bond glass in Ba2YMoO6, in NEW JOURNAL OF PHYSICS, 15, 043024.
Phase diagram with an enhanced spin-glass region of the mixed Ising-XY magnet LiHoxEr1-xF4
Piatek J. O., Dalla Piazza B., Nikseresht N., Tsyrulin N., Zivkovic I., Kraemer K. W., Laver M., Prokes K., Matas S., Christensen N. B., Ronnow H. M. (2013), Phase diagram with an enhanced spin-glass region of the mixed Ising-XY magnet LiHoxEr1-xF4, in PHYSICAL REVIEW B, 88(1), 014408.
Possible spin-orbit driven spin-liquid ground state in the double perovskite phase of Ba3YIr2O9
Dey Tusharkanti, Mahajan A. V., Kumar R., Koteswararao B., Chou F. C., Omrani A. A., Ronnow H. M. (2013), Possible spin-orbit driven spin-liquid ground state in the double perovskite phase of Ba3YIr2O9, in PHYSICAL REVIEW B, 88(13), 134425.
Robustness of Basal-Plane Antiferromagnetic Order and the J(eff)=1/2 State in Single-Layer Iridate Spin-Orbit Mott Insulators
Boseggia S., Springell R., Walker H. C., Ronnow H. M., Rueegg Ch., Okabe H., Isobe M., Perry R. S., Collins S. P., McMorrow D. F. (2013), Robustness of Basal-Plane Antiferromagnetic Order and the J(eff)=1/2 State in Single-Layer Iridate Spin-Orbit Mott Insulators, in PHYSICAL REVIEW LETTERS, 110(11), 117207.
Temperature-dependent electron-phonon coupling in La2-xSrxCuO4 probed by femtosecond x-ray diffraction
Mansart B., Cottet M. J. G., Mancini G. F., Jarlborg T., Dugdale S. B., Johnson S. L., Mariager S. O., Milne C. J., Beaud P., Gruebel S., Johnson J. A., Kubacka T., Ingold G., Prsa K., Ronnow H. M., Conder K., Pomjakushina E., Chergui M., Carbone F. (2013), Temperature-dependent electron-phonon coupling in La2-xSrxCuO4 probed by femtosecond x-ray diffraction, in PHYSICAL REVIEW B, 88(5), 054507.

Collaboration

Group / person Country
Types of collaboration
Prof. A. Mahajan, IIT Bombay, India India (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Prof. McMorrow, London Centre for Nanotechnology Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
- Exchange of personnel
Dr. M. Moretti, ESRF, Grenoble, France France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Prof. M. Isobe, National Institute for Materials Science, Tsukuba, Japan Japan (Asia)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Dr. M. A. de Vries, University of Edinburgh, Scotland Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Prof. N. Marzari, EPFL Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Prof. Tjernberg, KTH - Royal Institute of Technology Sweden (Europe)
- Publication
- Research Infrastructure
Dr. L. Moreschini, Advanced Light Source, Berkeley, USA United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events



Self-organised

Title Date Place
Mott Physics Beyond the Heisenberg Model 16.09.2014 Oriel College, Oxford, Great Britain and Northern Ireland
Mott Physics Beyond the Heisenberg Model 26.10.2013 Monte Verità, Switzerland

Awards

Title Year
Springer Thesis Award 2015
2014 - Josep Askenazi Prize 2014

Associated projects

Number Title Start Funding scheme
162626 Frustration in Quantum and Classical Magnets 01.12.2015 Project funding (Div. I-III)
157771 Cryofree magnet with variable temperature insert 01.02.2015 R'EQUIP
150713 ZEBRA - a new neutron single-crystal diffractometer optimized for small samples and extreme conditions 01.11.2014 R'EQUIP
130522 Quantum Magnetism - Dimer Physics and Dipolar Criticality 01.04.2010 Project funding (Div. I-III)
137870 Superconducting iron chalcogenides 01.05.2012 Project funding (Div. I-III)
126751 Nanofabricated devices based on intrinsically layered correlated electron materials 01.12.2009 Project funding (Div. I-III)
149651 High resolution spectroscopy of strongly correlated electron systems and artificial structures at surfaces 01.10.2013 Project funding (Div. I-III)
164013 Laser-heated Floating Zone Furnace for EPFL Crystal Growth Facility 01.11.2016 R'EQUIP
137322 Development of Teaching and Research Capacities in Condensed Matter Physics and Materials Science at Tbilisi State University 01.08.2011 SCOPES
140862 Quantum Frustration in Model Magnets 01.07.2012 Project funding (Div. I-III)
134994 Synthesis, structural and physical investigations of novel superconductors and III-V ternary nitrides 01.07.2011 Project funding (Div. I-III)
141325 Coupled spin, charge and orbital dynamics of low-dimensional cuprates 01.09.2013 Project funding (Div. I-III)
142434 Strongly correlated metals beyond the Fermi liquid concept 01.09.2012 Ambizione
146870 Quantum Magnetism - Spinons, Skyrmions and Dipoles 01.04.2013 Project funding (Div. I-III)
178867 Electron-Phonon Interactions in Rare-Earth Nickelates and Superconducting Cuprates 01.10.2018 Project funding (Div. I-III)
163997 High temperature, high pressure floating zone crystal growth setup 01.03.2016 R'EQUIP
162593 High resolution spectroscopy of strongly correlated electron systems and artificial structures at surfaces 01.12.2015 Project funding (Div. I-III)
133815 Setup for studies of quantum phenomena in condensed matter systems at ultra-low temperatures in magnetic vector fields 01.04.2012 R'EQUIP
129970 Theoretical support for resonant soft X-ray spectroscopy and related experiments at SLS 01.04.2011 Project funding (Div. I-III)
162110 Harnessing Molecular Crystals for Quantum Magnets and Elucidating Quantum Critical Physics 01.03.2016 Bilateral programmes
160765 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2016 Sinergia
144972 High efficiency neutron spectrometer optimized for investigations under extreme conditions 01.01.2014 R'EQUIP

Abstract

The Mott Insulating state is one of the most fundamental consequences of strong electron interaction in concert with quantum mechanics. In its simplest form, it projects the low energy sector onto a magnetic Heisenberg model, which has played a central role over the past sixty years of unveiling the magnetic properties of Mott insulators. However, it has become increasingly clear that new quantum phases of matter can occur in cases where the Heisenberg approximation is not sufficient. This Sinergia proposal aims to unite leading groups in their respective domains of material synthesis, experiments and theory for a focused coherent effort to study new materials beyond the Heisenberg approximation. Specifically, we shall investigate . i) in the presence of orbital degeneracy, where an extra local degree of freedom has to be taken into account, ii) close to the metal-insulator transition, where more complicated spin-spin interactions become significant, or iii) systems like iridates, where the effective local spin-1/2 degree of freedom may lead to strongly anisotropic interactions. The initial thrust will be on investigations of iridium-oxides - an emerging material class which has recently attracted considerable attention world-wide.
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