Strong anisotropy within a Heisenberg model in the Jeff=1/2 insulating state of Sr2Ir0.8Ru0.2O4

被引：6

作者：

Calder, S. ^{[1
]}

Kim, J. W. ^{[2
]}

Taylor, A. E. ^{[1
]}

Upton, M. H. ^{[2
]}

Casa, D. ^{[2
]}

Cao, Guixin ^{[3
,4
]}

Mandrus, D. ^{[3
,4
]}

Lumsden, M. D. ^{[1
]}

Christianson, A. D. ^{[1
]}

机构：

[1] Oak Ridge Natl Lab, Quantum Condensed Matter Div, Oak Ridge, TN 37831 USA

[2] Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[4] Oak Ridge Natl Lab, Mat Sci & Technol Div, Oak Ridge, TN 37831 USA

来源：

PHYSICAL REVIEW B | 2016年 / 94卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.94.220407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 L-3 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 J(eff) = 1/2 moments are diluted.

引用

页数：5

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