物理
马格农
凝聚态物理
相图
共振非弹性X射线散射
订单(交换)
散射
相(物质)
非弹性中子散射
非弹性散射
铁磁性
量子力学
财务
经济
作者
H. Gretarsson,N. H. Sung,J. Porras,Joel Bertinshaw,Christopher Dietl,J. A. N. Bruin,A. F. Bangura,Y. K. Kim,Robert E. Dinnebiér,Jungho Kim,Ali Al-Zein,M. Moretti Sala,M. Krisch,Matthieu Le Tacon,B. Keimer,B. J. Kim
标识
DOI:10.1103/physrevlett.117.107001
摘要
We have studied the magnetic excitations of electron-doped ${\mathrm{Sr}}_{2\ensuremath{-}x}{\mathrm{La}}_{x}{\mathrm{IrO}}_{4}$ ($0\ensuremath{\le}x\ensuremath{\le}0.10$) using resonant inelastic x-ray scattering at the Ir ${L}_{3}$ edge. The long-range magnetic order is rapidly lost with increasing $x$, but two-dimensional short-range order (SRO) and dispersive magnon excitations with nearly undiminished spectral weight persist well into the metallic part of the phase diagram. The magnons in the SRO phase are heavily damped and exhibit anisotropic softening. Their dispersions are well described by a pseudospin-$1/2$ Heisenberg model with exchange interactions whose spatial range increases with doping. We also find a doping-independent high-energy magnetic continuum, which is not described by this model. The spin-orbit excitons arising from the pseudospin-$3/2$ manifold of the Ir ions broaden substantially in the SRO phase, but remain largely separated from the low-energy magnons. Pseudospin-$1/2$ models are therefore a good starting point for the theoretical description of the low-energy magnetic dynamics of doped iridates.
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