Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4
Momentum-resolved lattice dynamics of parent and electron-doped Sr2IrO4
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DOI：
10.1103/physrevb.100.085131
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发表时间：
2019-04
影响因子：
3.7
通讯作者：
C. D. Dashwood;H. Miao;J. G. Vale;D. Ishikawa;D. Prishchenko;V. Mazurenko;V. Mazurenko;R. Perry;G. Cao;A. D. L. Torre;F. Baumberger;A. Baron;D. McMorrow;M. Dean
中科院分区：
文献类型：
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作者：
C. D. Dashwood;H. Miao;J. G. Vale;D. Ishikawa;D. Prishchenko;V. Mazurenko;V. Mazurenko;R. Perry;G. Cao;A. D. L. Torre;F. Baumberger;A. Baron;D. McMorrow;M. Dean
混合的轨道和自旋字符的波函数的$5d$铱酸盐导致预测的强耦合之间的晶格，电子和磁激发。除了实现一种新的自旋-轨道辅助Mott绝缘基态之外，钙钛矿铱酸盐Sr$_{2}$IrO$_{4}$已被证明与铜酸盐La$_{2}$CuO$_{4}$具有很强的相似性，其在掺杂时具有许多对称性破缺相，例如似乎与高温超导性密切相关的电荷密度波。这些现象可以通过动量分辨的晶格动力学测量灵敏地探测，通过meV分辨率的非弹性X射线散射成为可能。在这里，我们报告的第一个这样的测量母体和电子掺杂的Sr$_{2}$IrO$_{4}$，我们解释的帮助下，密度泛函理论计算和对比的声子行为的欠掺杂的铜酸盐。
The mixing of orbital and spin character in the wavefunctions of the $5d$ iridates has led to predictions of strong couplings between their lattice, electronic and magnetic excitations. As well as realising a novel spin-orbit assisted Mott insulating ground state, the perovskite iridate Sr$_{2}$IrO$_{4}$ has been shown to have strong similarities with the cuprate La$_{2}$CuO$_{4}$, which on doping hosts many broken symmetry phases such as charge density waves that appear to be intimately linked to high-temperature superconductivity. These phenomena can be sensitively probed through momentum-resolved measurements of the lattice dynamics, made possible by meV-resolution inelastic x-ray scattering. Here we report the first such measurements for parent and electron-doped Sr$_{2}$IrO$_{4}$, which we interpret with the help of density functional theory calculations and contrast with the phonon behaviour of the underdoped cuprates.