Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4

doi:10.1103/PhysRevB.99.085125

This content will become publicly available on February 15, 2020

Title: Pseudospin-lattice coupling in the spin-orbit Mott insulator ${Sr}_{2} {IrO}_{4}$

Full Record
Other Related Research

Abstract

Spin-orbit entangled magnetic dipoles, often referred to as pseudospins, provide a new avenue to explore novel magnetism inconceivable in the weak spin-orbit coupling limit, but the nature of their low-energy interactions remains to be understood. In this paper, we present a comprehensive study of the static magnetism and low-energy pseudospin dynamics in the archetypal spin-orbit Mott insulator Sr ₂IrO ₄. We find that in order to understand even basic magnetization measurements, a formerly overlooked in-plane anisotropy is fundamental. In addition to magnetometry, we use neutron diffraction, inelastic neutron scattering, and resonant elastic and inelastic x-ray scattering to identify and quantify the interactions that determine the global symmetry of the system and govern the linear responses of pseudospins to external magnetic fields and their low-energy dynamics. We find that a pseudospin-only Hamiltonian is insufficient for an accurate description of the magnetism in Sr ₂IrO ₄ and that pseudospin-lattice coupling is essential. In conclusion, this finding should be generally applicable to other pseudospin systems with sizable orbital moments sensitive to anisotropic crystalline environment

Authors:

Porras, J. ^[1]; Bertinshaw, J. ^[1]; Liu, H. ^[1]; Khaliullin, G. ^[1]; Sung, N. H. ^[1]; Kim, J. -W. ^[2]; Francoual, S. ^[3]; Steffens, P. ^[4]; Deng, G. ^[5]; Sala, M. Moretti ^[6]; Efimenko, A. ^[7]; Said, A. ^[2]; Casa, D. ^[2]; Huang, X. ^[2]; Gog, T. ^[2]; Kim, J. ^[2]; Keimer, B. ^[1]; Kim, B. J. ^[8]

Max-Planck-Institut für Festkörperforschung, Stuttgart (Germany)
Argonne National Lab. (ANL), Argonne, IL (United States)
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Institut Laue-Langevin 6, rue Jules Horowitz (France)
Australian Nuclear Science and Technology Organization, Lucas Height, New South Wales (Australia)
European Synchrotron Radiation Facility (France); Politecnico di Milano, Piazza Leonardo da Vinci, Milano (Italy)
European Synchrotron Radiation Facility (France)
Max-Planck-Institut für Festkörperforschung, Stuttgart (Germany); Pohang University of Science and Technology (South Korea); Institute for Basic Science (South Korea)

Publication Date:: 2019-02-15

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC); Institute for Basic Science

OSTI Identifier:: 1496059

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 99; Journal Issue: 8; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE

Citation Formats


                    Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Efimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., and Kim, B. J. Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4.  United States: N. p., 2019. 
        Web.  doi:10.1103/PhysRevB.99.085125.

Copy to clipboard


                    Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Efimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., & Kim, B. J. Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4.  United States.  doi:10.1103/PhysRevB.99.085125.

Copy to clipboard


                    Porras, J., Bertinshaw, J., Liu, H., Khaliullin, G., Sung, N. H., Kim, J. -W., Francoual, S., Steffens, P., Deng, G., Sala, M. Moretti, Efimenko, A., Said, A., Casa, D., Huang, X., Gog, T., Kim, J., Keimer, B., and Kim, B. J. Fri .  
        "Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4".  United States.  doi:10.1103/PhysRevB.99.085125.

Copy to clipboard


                    
@article{osti_1496059,

  title        = {Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr2IrO4},

  author       = {Porras, J. and Bertinshaw, J. and Liu, H. and Khaliullin, G. and Sung, N. H. and Kim, J. -W. and Francoual, S. and Steffens, P. and Deng, G. and Sala, M. Moretti and Efimenko, A. and Said, A. and Casa, D. and Huang, X. and Gog, T. and Kim, J. and Keimer, B. and Kim, B. J.},

  abstractNote = {Spin-orbit entangled magnetic dipoles, often referred to as pseudospins, provide a new avenue to explore novel magnetism inconceivable in the weak spin-orbit coupling limit, but the nature of their low-energy interactions remains to be understood. In this paper, we present a comprehensive study of the static magnetism and low-energy pseudospin dynamics in the archetypal spin-orbit Mott insulator Sr2IrO4. We find that in order to understand even basic magnetization measurements, a formerly overlooked in-plane anisotropy is fundamental. In addition to magnetometry, we use neutron diffraction, inelastic neutron scattering, and resonant elastic and inelastic x-ray scattering to identify and quantify the interactions that determine the global symmetry of the system and govern the linear responses of pseudospins to external magnetic fields and their low-energy dynamics. We find that a pseudospin-only Hamiltonian is insufficient for an accurate description of the magnetism in Sr2IrO4 and that pseudospin-lattice coupling is essential. In conclusion, this finding should be generally applicable to other pseudospin systems with sizable orbital moments sensitive to anisotropic crystalline environment},

  doi          = {10.1103/PhysRevB.99.085125},

  journal      = {Physical Review B},

  number       = 8,

  volume       = 99,

  place        = {United States},

  year         = {2019},

  month        = {2}

}

Copy to clipboard

Journal Article:

Free Publicly Available Full Text

This content will become publicly available on February 15, 2020

Publisher's Version of Record

DOI: 10.1103/PhysRevB.99.085125

Other availability

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar Records in DOE PAGES and OSTI.GOV collections:

Honeycomb lattice ${Na}_{2} {IrO}_{3}$ at high pressures: A robust spin-orbit Mott insulator

Journal Article Xi, Xiaoxiang ; Bo, Xiangyan ; Xu, X. S. ; ... - Physical Review B

The honeycomb iridate Na ₂IrO ₃ has received much attention as a candidate to realize a quantum spin liquid state, but the nature of its insulating state remains controversial. We found that the material exhibits structural transitions at 3 and 10 GPa. The former is accompanied by 166-meV suppression of the activation gap, but the energies for the low-lying interband transitions change by less than 10 meV. This can be reconciled in a picture in which the application of high pressure barely shifts the electronic bands, but rather merely broadens them. First-principles calculations uncover a strong correlation between the bandmore »« less
DOI: 10.1103/PhysRevB.98.125117
Spin-orbit coupling, strong correlation, and insulator-metal transitions: The $J_{eff} = \frac{3}{2}$ ferromagnetic Dirac-Mott insulator ${Ba}_{2} {NaOsO}_{6}$

Journal Article Gangopadhyay, Shruba ; Pickett, Warren E. - Physical Review. B, Condensed Matter and Materials Physics

The double perovskite Ba ₂NaOsO ₆ (BNOO), an exotic example of a very high oxidation state (heptavalent) osmium d1 compound and also uncommon by being a ferromagnetic open d-shell (Mott) insulator without Jahn-Teller (JT) distortion, is modeled using a density functional theory based hybrid functional incorporating exact exchange for correlated electronic orbitals and including the large spin-orbit coupling (SOC). The experimentally observed narrow-gap ferromagnetic insulating ground state is obtained, but only when including spin-orbit coupling, making this a Dirac-Mott insulator. The calculated easy axis along [110] is in accord with experiment, providing additional support that this approach provides a realisticmore »« less
Cited by 14
DOI: 10.1103/PhysRevB.91.045133

Full Text Available
Correlation Effects and Hidden Spin-Orbit Entangled Electronic Order in Parent and Electron-Doped Iridates ${Sr}_{2} {IrO}_{4}$

Journal Article Zhou, Sen ; Jiang, Kun ; Chen, Hua ; ... - Physical Review. X

Analogs of the high- T _c cuprates have been long sought after in transition metal oxides. Because of the strong spin-orbit coupling, the 5 d perovskite iridates Sr ₂IrO ₄ exhibit a low-energy electronic structure remarkably similar to the cuprates. Whether a superconducting state exists as in the cuprates requires understanding the correlated spin-orbit entangled electronic states. Recent experiments discovered hidden order in the parent and electron-doped iridates, some with striking analogies to the cuprates, including Fermi surface pockets, Fermi arcs, and pseudogap. Here, we study the correlation and disorder effects in a five-orbital model derived from the band theory.more »« less
Cited by 5
DOI: 10.1103/physrevx.7.041018

Full Text Available
Anisotropic antiferromagnetic order in the spin-orbit coupled trigonal-lattice ${Ca}_{2} {Sr}_{2} {IrO}_{6}$

Journal Article Sheng, Jieming ; Ye, Feng ; Hoffmann, Christina ; ... - Physical Review B

Here, we used single-crystal x-ray and neutron diffraction to investigate the crystal and magnetic structures of trigonal lattice iridate Ca ₂Sr ₂IrO ₆. The crystal structure is determined to be R¯3 with two distinct Ir sites. The system exhibits long-range antiferromagnetic order below T _N = 13.1 K. The magnetic wave vector is identified as (0,0.5,1) with ferromagnetic coupling along the a axis and antiferromagnetic correlation along the b axis. Spins align dominantly within the basal plane along the [1,2,0] direction and tilt 34° toward the c axis. The ordered moment is 0.66(3) μ _B/Ir, larger than other iridates wheremore »« less
DOI: 10.1103/PhysRevB.97.235116
Electrical Control of Structural and Physical Properties via Strong Spin-Orbit Interactions in ${Sr}_{2} {IrO}_{4}$

Journal Article Cao, Gang ; Terzic, J. ; Zhao, H. D. ; ... - Physical Review Letters

Electrical control of structural and physical properties is a long-sought, but elusive goal of contemporary science and technology. We propose that a combination of strong spin-orbit interactions (SOI) and a canted antiferromagnetic Mott state is sufficient to attain that goal. The antiferromagnetic insulator Sr ₂IrO ₄ provides a model system in which strong SOI lock canted Ir magnetic moments to IrO6 octahedra, causing them to rigidly rotate together. A novel coupling between an applied electrical current and the canting angle reduces the N´eel temperature and drives a large, nonlinear lattice expansion that closely tracks the magnetization, increases the electron mobility,more »« less
Cited by 4
DOI: 10.1103/physrevlett.120.017201

Full Text Available

Similar Records

This content will become publicly available on February 15, 2020

Title: Pseudospin-lattice coupling in the spin-orbit Mott insulator Sr 2 IrO 4

Abstract

Citation Formats

Title: Pseudospin-lattice coupling in the spin-orbit Mott insulator ${Sr}_{2} {IrO}_{4}$