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 ${Sr}_{2} {Ir}_{0.8} {Ru}_{0.2} O_{4}$

Journal Article · Wed Dec 28 00:00:00 EST 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.220407· OSTI ID:1339404

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

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.

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

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

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

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

OSTI ID:: 1339404

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

Journal Information:: Physical Review B, Vol. 94, Issue 22; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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Cited By (2)

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