Magnetic Excitation Spectra of Sr2IrO4 Probed by Resonant Inelastic X-Ray Scattering: Establishing Links to Cuprate Superconductors

被引：421

作者：

Kim, Jungho ^{[1
]}

Casa, D. ^{[1
]}

Upton, M. H. ^{[1
]}

Gog, T. ^{[1
]}

Kim, Young-June ^{[2
]}

Mitchell, J. F. ^{[3
]}

van Veenendaal, M. ^{[1
,4
]}

Daghofer, M. ^{[5
]}

van den Brink, J. ^{[5
]}

Khaliullin, G. ^{[6
]}

Kim, B. J. ^{[3
]}

机构：

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

[2] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[3] Argonne Natl Lab, Div Mat Sci, Argonne, IL 60439 USA

[4] No Illinois Univ, Dept Phys, De Kalb, IL 60115 USA

[5] IFW Dresden, Inst Theoret Solid Sate Phys, D-01069 Dresden, Germany

[6] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 17期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

MOTT-INSULATOR; TRANSITION; PHYSICS;

D O I：

10.1103/PhysRevLett.108.177003

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We used resonant inelastic x-ray scattering to reveal the nature of magnetic interactions in Sr2IrO4, a 5d transition-metal oxide with a spin-orbit entangled ground state and J(eff) = 1/2 magnetic moments. The magnon dispersion in Sr2IrO4 is well-described by an antiferromagnetic Heisenberg model with an effective spin one-half on a square lattice, which renders the low-energy effective physics of Sr2IrO4 much akin to that in superconducting cuprates. This point is further supported by the observation of exciton modes in Sr2IrO4, whose dispersion is strongly renormalized by magnons, which can be understood by analogy to hole propagation in the background of antiferromagnetically ordered spins in the cuprates.

引用

页数：5

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