Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr2IrO4
Spectroscopic Evidence for Electron-Boson Coupling in Electron-Doped Sr2IrO4
复制标题
DOI：
10.1103/physrevlett.123.216402
复制
发表时间：
2019-11-21
影响因子：
8.6
通讯作者：
He, J. -F.
中科院分区：
文献类型：
--
作者：
Hu, Yong;Chen, Xiang;He, J. -F.
赝隙、d波超导性和电子-玻色子耦合是铜酸盐相图中相互交织的三个关键因素。Sr(2)IrO(4)是铜酸盐的5d电子对应物，其中的赝隙和d波不稳定性都被观察到。在这里，我们报告了在电子掺杂的Sr2IrO4中存在第三个关键因素的光谱证据：电子-玻色子耦合。在类似于50 meV的能量尺度上观察到节点色散的扭结。扭结的强度随掺杂而变化，但能量尺度不变。这些结果为探索掺杂Mott绝缘体中赝隙、d波不稳定性和电子-玻色子耦合之间的关系提供了第一个非铜平台。
The pseudogap, d-wave superconductivity and electron-boson coupling are three intertwined key ingredients in the phase diagram of the cuprates. Sr(2)IrO(4 )is a 5d-electron counterpart of the cuprates in which both the pseudogap and a d-wave instability have been observed. Here, we report spectroscopic evidence for the presence of the third key player in electron-doped Sr2IrO4: electron-boson coupling. A kink in nodal dispersion is observed with an energy scale of similar to 50 meV. The strength of the kink changes with doping, but the energy scale remains the same. These results provide the first noncuprate platform for exploring the relationship between the pseudogap, d-wave instability, and electron-boson coupling in doped Mott insulators.