Strong anisotropy within a Heisenberg model in the Jeff=12 insulating state of Sr2Ir0.8Ru0.2O4

Calder, Stuart A.; Kim, J. W.; Taylor, Alice E.; Upton, M. H.; Casa, D.; Cao, Guixin; Mandrus, D.; Lumsden, Mark D.; Christianson, Andrew D.

doi:10.1103/PhysRevB.94.220407

Title: Strong anisotropy within a Heisenberg model in the $J_{eff} = \frac{1}{2}$ insulating state of ${Sr}_{2} {Ir}_{0.8} {Ru}_{0.2} O_{4}$

Abstract

The dispersive magnetic excitations in Sr2IrO4 have previously been well described within an isospin-1/2 Heisenberg model on a square lattice that revealed parallels with La2CuO4. Here we investigate the inelastic spectra of Sr2Ir0.8Ru0.2O4 with resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge. The results are well described using linear spin-wave theory within a similar Heisenberg model applicable to Sr2IrO4; however, the disorder induced by the substitution of 20%Ir4+ ions for Ru4+ removes longer range exchange interactions. A large spin gap (40 meV) is measured indicating strong anisotropy from spin-orbit coupling that is manifest due to the altered magnetic structure in Sr2Ir0.8Ru0.2O4 with c-axis aligned moments compared to the basal plane moments in the parent. Collectively the results indicate the robustness of a Heisenberg model description even when the magnetic structure is altered and the Jeff=1/2 moments are diluted.

Authors:

Calder, Stuart A. ^[1]; Kim, J. W. ^[2]; Taylor, Alice E. ^[1]; Upton, M. H. ^[2]; Casa, D. ^[2]; Cao, Guixin ^[3]; Mandrus, D. ^[3]; Lumsden, Mark D. ^[1]; Christianson, Andrew D. ^[1]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source
Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division

Publication Date:: Wed Dec 28 00:00:00 EST 2016

Research Org.:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Contributing Org.:: Univ. of Tennessee, Knoxville, TN (United States)

OSTI Identifier:: 1339404

Alternate Identifier(s):: OSTI ID: 1338085; OSTI ID: 1486924

Grant/Contract Number:: AC05-00OR22725; AC02-06CH11357

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 94; Journal Issue: 22; 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

Citation Formats


                    Calder, Stuart A., Kim, J. W., Taylor, Alice E., Upton, M. H., Casa, D., Cao, Guixin, Mandrus, D., Lumsden, Mark D., and Christianson, Andrew D. Strong anisotropy within a Heisenberg model in the Jeff=12 insulating state of Sr2Ir0.8Ru0.2O4.  United States: N. p., 2016. 
Web.  doi:10.1103/PhysRevB.94.220407.

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                    Calder, Stuart A., Kim, J. W., Taylor, Alice E., Upton, M. H., Casa, D., Cao, Guixin, Mandrus, D., Lumsden, Mark D., & Christianson, Andrew D. Strong anisotropy within a Heisenberg model in the Jeff=12 insulating state of Sr2Ir0.8Ru0.2O4.  United States.  https://doi.org/10.1103/PhysRevB.94.220407

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                    Calder, Stuart A., Kim, J. W., Taylor, Alice E., Upton, M. H., Casa, D., Cao, Guixin, Mandrus, D., Lumsden, Mark D., and Christianson, Andrew D. Wed .  
"Strong anisotropy within a Heisenberg model in the Jeff=12 insulating state of Sr2Ir0.8Ru0.2O4".  United States.  https://doi.org/10.1103/PhysRevB.94.220407.  https://www.osti.gov/servlets/purl/1339404.

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@article{osti_1339404,

  title        = {Strong anisotropy within a Heisenberg model in the Jeff=12 insulating state of Sr2Ir0.8Ru0.2O4},

  author       = {Calder, Stuart A. and Kim, J. W. and Taylor, Alice E. and Upton, M. H. and Casa, D. and Cao, Guixin and Mandrus, D. and Lumsden, Mark D. and Christianson, Andrew D.},

  abstractNote = {The dispersive magnetic excitations in Sr2IrO4 have previously been well described within an isospin-1/2 Heisenberg model on a square lattice that revealed parallels with La2CuO4. Here we investigate the inelastic spectra of Sr2Ir0.8Ru0.2O4 with resonant inelastic x-ray scattering (RIXS) at the Ir L3 edge. The results are well described using linear spin-wave theory within a similar Heisenberg model applicable to Sr2IrO4; however, the disorder induced by the substitution of 20%Ir4+ ions for Ru4+ removes longer range exchange interactions. A large spin gap (40 meV) is measured indicating strong anisotropy from spin-orbit coupling that is manifest due to the altered magnetic structure in Sr2Ir0.8Ru0.2O4 with c-axis aligned moments compared to the basal plane moments in the parent. Collectively the results indicate the robustness of a Heisenberg model description even when the magnetic structure is altered and the Jeff=1/2 moments are diluted.},

  doi          = {10.1103/PhysRevB.94.220407},

  journal      = {Physical Review B},

  number       = 22,

  volume       = 94,

  place        = {United States},

  year         = {Wed Dec 28 00:00:00 EST 2016},

  month        = {Wed Dec 28 00:00:00 EST 2016}

}

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https://doi.org/10.1103/PhysRevB.94.220407

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FIG. 1: (a) Structural (red circles) and magnetic (black circles) reciprocal space. High symmetry magnetic zone boundary points are indicated by the blue diamonds. H and K points are labeled along with the labeling in the square lattice notation used to describe the dispersions. The square lattice is rotated frommore »

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Works referencing / citing this record:

Spin-orbit-controlled metal–insulator transition in Sr2IrO4
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Zwartsenberg, B.; Day, R. P.; Razzoli, E.
Nature Physics, Vol. 16, Issue 3
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FIG. 1 (p. 2)

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FIG. 3 (p. 4)

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Title: Strong anisotropy within a Heisenberg model in the J eff = 1 2 insulating state of Sr 2 Ir 0.8 Ru 0.2 O 4

Abstract

Citation Formats

Figures / Tables:

Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet journal, April 2016

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Twisted Hubbard Model for Sr 2 IrO 4 : Magnetism and Possible High Temperature Superconductivity journal, March 2011

Low-energy magnetic excitations in the spin-orbital Mott insulator Sr 2 IrO 4 journal, May 2014

Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet journal, June 2014

Evolution of competing magnetic order in the J eff = 1 / 2 insulating state of Sr 2 Ir 1 − x Ru x O 4 journal, October 2015

Dilute magnetism and spin-orbital percolation effects in Sr 2 Ir 1 − x Rh x O 4 journal, February 2014

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Spin Waves and Electronic Interactions in La 2 CuO 4 journal, June 2001

Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models journal, January 2009

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Excitonic quasiparticles in a spin–orbit Mott insulator journal, July 2014

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Anisotropic softening of magnetic excitations in lightly electron-doped Sr 2 IrO 4 journal, June 2016

Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates journal, May 2011

Persistent Paramagnons Deep in the Metallic Phase of Sr 2 − x La x IrO 4 journal, September 2016

Spin-orbit-controlled metal–insulator transition in Sr2IrO4 journal, January 2020

A high-energy-resolution resonant inelastic X-ray scattering spectrometer at ID20 of the European Synchrotron Radiation Facility journal, February 2018

Title: Strong anisotropy within a Heisenberg model in the $J_{eff} = \frac{1}{2}$ insulating state of ${Sr}_{2} {Ir}_{0.8} {Ru}_{0.2} O_{4}$

Proximate Kitaev quantum spin liquid behaviour in a honeycomb magnet
journal, April 2016

All-in–all-Out Magnetic Order and Propagating Spin Waves in ${Sm}_{2} {Ir}_{2} O_{7}$
journal, July 2016

Phase-Sensitive Observation of a Spin-Orbital Mott State in Sr2IrO4
journal, March 2009

Correlated Quantum Phenomena in the Strong Spin-Orbit Regime
journal, March 2014

MERIX—Next generation medium energy resolution inelastic X-ray scattering instrument at the APS
journal, June 2013

Twisted Hubbard Model for ${Sr}_{2} {IrO}_{4}$ : Magnetism and Possible High Temperature Superconductivity
journal, March 2011

Low-energy magnetic excitations in the spin-orbital Mott insulator ${Sr}_{2} {IrO}_{4}$
journal, May 2014

Fermi arcs in a doped pseudospin-1/2 Heisenberg antiferromagnet
journal, June 2014

Evolution of competing magnetic order in the $J_{eff} = 1 / 2$ insulating state of ${Sr}_{2} {Ir}_{1 - x} {Ru}_{x} O_{4}$
journal, October 2015

Dilute magnetism and spin-orbital percolation effects in ${Sr}_{2}$ ${Ir}_{1 - x}$ ${Rh}_{x}$ $O_{4}$
journal, February 2014

Linear spin wave theory for single-Q incommensurate magnetic structures
journal, March 2015

Spin Waves and Electronic Interactions in ${La}_{2} {CuO}_{4}$
journal, June 2001

Mott Insulators in the Strong Spin-Orbit Coupling Limit: From Heisenberg to a Quantum Compass and Kitaev Models
journal, January 2009

Direct evidence for dominant bond-directional interactions in a honeycomb lattice iridate Na2IrO3
journal, May 2015

Excitonic quasiparticles in a spin–orbit Mott insulator
journal, July 2014

Importance of $X Y$ anisotropy in ${Sr}_{2} {IrO}_{4}$ revealed by magnetic critical scattering experiments
journal, July 2015

Anisotropic softening of magnetic excitations in lightly electron-doped ${Sr}_{2} {IrO}_{4}$
journal, June 2016

Topological semimetal and Fermi-arc surface states in the electronic structure of pyrochlore iridates
journal, May 2011

Persistent Paramagnons Deep in the Metallic Phase of ${Sr}_{2 - x} {La}_{x} {IrO}_{4}$
journal, September 2016

Spin-orbit-controlled metal–insulator transition in Sr2IrO4
journal, January 2020

A high-energy-resolution resonant inelastic X-ray scattering spectrometer at ID20 of the European Synchrotron Radiation Facility
journal, February 2018