Direct observation of the electronic structure of the layered phosphide superconductor ZrP2－xSex
Direct observation of the electronic structure of the layered phosphide superconductor ZrP2－xSex
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层状磷化物超导体ZrP2－xSex电子结构的直接观察
DOI：
10.1103/physrevb.105.195111
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发表时间：
2022
影响因子：
3.7
通讯作者：
Yanagi Y.
中科院分区：
文献类型：
--
作者：
Ino A.;Kubo T.;Ishizaka S.;Takita H.;Mansuer W.;Shimada K.;Ueda S.;Kit? H.;Hase I.;Ishida S.;Oka K.;Fujihisa H.;Gotoh Y.;Yoshida Y.;Iyo A.;Ogino H.;Eisaki H.;Kawashima K.;Yanagi Y.
层状磷化物超导体（= Zr和Hf;= Se和S）有望成为探索新超导体的立足点。在这里，我们报告的电子结构的直接实验观察（，0.60，0.75，和0.85），使用高分辨率的体敏硬X射线光电子能谱。核心级光谱的P显示两个不同的组件分开的能量为1.2 eV。结果表明，两个晶位上的P原子具有不同的价电荷，起着不同的化学作用，而且它们之间的占位比随温度单调变化。我们观察到的价带特征，和一个明确的费米边缘。与第一性原理计算结果的一致性表明，费米能级上的电子态主要归属于Zr带。值得注意的是，费米能级附近的一个驼峰特征显示出从0.85到0.55的能量向上移动了0.49 eV。光谱特征的能量位移证实了掺杂具有空穴掺杂的作用，从而揭示了掺杂的可调谐性。这些电子结构的发现为理解超导体的超导电性奠定了重要的基础。
A layered phosphide superconductor,(= Zr and Hf;= Se and S), is expected to be a foothold for the quest of new superconductors. Here, we report direct experimental observation of the electronic structure of(, 0.60, 0.75, and 0.85), using high-resolution bulk-sensitive hard x-ray photoemission spectroscopy. Core-level spectra of P show two distinct components separated by an energy of 1.2 eV. These reveal that the P atoms at two crystallographic sites have different valence charges,and, playing different chemical roles, and furthermore that the occupation ratio between them varies monotonically with. We observed valence-band features at, andeV together with a clear Fermi edge. The consistency with first-principles calculation indicates that the electronic states at Fermi level are mainly ascribed to the Zrband. Notably, a hump feature near the Fermi level shows an upward energy shift by 0.49 eV with decreasingfrom 0.85 to 0.55. The energy shifts of spectral features substantiate that replacingwithserves as hole doping, shedding light on the tunability of. These findings on the electronic structure establish an essential basis for understanding the superconductivity in thesystem.