Sr $_{2-x}$ La $_x$ IrO $_4$金属相深处的持久顺磁
Persistent paramagnons deep in the metallic phase of Sr$_{2-x}$La$_x$IrO$_4$
摘要：
本文用共振非弹性X射线散射（RIXS）方法研究了电子掺杂的Sr $_{2-x}$ La $_x$ IrO $_4$（$0 \leq x \leq 0.10$）在Ir L $_3$边的磁激发.随着$x$的增加，长程磁序迅速消失，但二维短程序（SRO）和色散磁振子激发几乎没有减少的光谱权重，持续到相图的金属部分。磁振子在SRO阶段是严重阻尼，表现出各向异性软化。它们的色散很好地描述了一个pseudospin-1/2海森堡模型与交换相互作用，其空间范围增加掺杂。我们还发现了一个不依赖于掺杂的高能磁连续体，这是没有描述这个模型。自旋-轨道激子所产生的赝自旋-3/2歧管的Ir离子大幅扩大在SRO阶段，但仍然在很大程度上分离的低能量的磁振子。因此，赝自旋1/2模型是一个很好的出发点，掺杂铱酸盐的低能磁动力学的理论描述。
英文摘要：
We have studied the magnetic excitations of electron-doped Sr$_{2-x}$La$_x$IrO$_4$ ($0 \leq x \leq 0.10$) using resonant inelastic x-ray scattering (RIXS) 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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