Electron-Doped Sr2IrO4: An Analogue of Hole-Doped Cuprate Superconductors Demonstrated by Scanning Tunneling Microscopy
Electron-Doped Sr2IrO4: An Analogue of Hole-Doped Cuprate Superconductors Demonstrated by Scanning Tunneling Microscopy
复制标题
电子掺杂 Sr2IrO4：扫描隧道显微镜展示的空穴掺杂铜酸盐超导体的类似物
DOI：
10.1103/physrevx.5.041018
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发表时间：
2016
影响因子：
12.5
通讯作者：
Feng D. L.
中科院分区：
文献类型：
--
作者：
Yan Y. J.;Ren M. Q.;Xu H. C.;Xie B. P.;Tao R.;Choi H. Y.;Lee N.;Choi Y. J.;Zhang T.;Feng D. L.
被预测为电子掺杂后的高温超导体，因为它在晶体结构、电子结构和磁耦合常数方面与铜酸盐非常相似。在这里，我们报告了一个扫描隧道显微镜/光谱（STM/STS）研究与表面电子掺杂的沉积钾（K）原子。我们发现，随着电子掺杂的增加，系统逐渐从绝缘状态演变到正常的金属状态，通过赝隙相，和一个尖锐的，V形的低能隙的状态密度（DOS）损失约95%的阶段。在一定的K覆盖率下（0.5-0.6单层），低能带隙的大小为25-30 meV，在50 K附近关闭。我们的观察表明，电子掺杂的铜氧化物超导体与空穴掺杂的铜氧化物超导体非常相似。
was predicted to be a high-temperature superconductor upon electron doping since it highly resembles the cuprates in crystal structure, electronic structure, and magnetic coupling constants. Here, we report a scanning tunneling microscopy/spectroscopy (STM/STS) study ofwith surface electron doping by depositing potassium (K) atoms. We find that as the electron doping increases, the system gradually evolves from an insulating state to a normal metallic state, via a pseudogaplike phase, and a phase with a sharp, V-shaped low-energy gap with about 95% loss of density of state (DOS) at. At certain K coverage (0.5–0.6 monolayer), the magnitude of the low-energy gap is 25–30 meV, and it closes at around 50 K. Our observations show that the electron-dopedremarkably resembles hole-doped cuprate superconductors.