2022年5月9日
Direct observation of the electronic structure of the layered phosphide superconductor ZrP2−xSex
Physical Review B
- 巻
- 105
- 号
- 19
- 開始ページ
- 195111
- 終了ページ
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1103/physrevb.105.195111
- 出版者・発行元
- American Physical Society (APS)
A layered phosphide superconductor, AP2-xXx (A = Zr and Hf; X = 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 ZrP2-xSex (x=0.55, 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, -1 and -3, playing different chemical roles, and furthermore that the occupation ratio between them varies monotonically with x. We observed valence-band features at -6.5, -4.0, and -1.4 eV 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 Zr 4d band. Notably, a hump feature near the Fermi level shows an upward energy shift by 0.49 eV with decreasing x from 0.85 to 0.55. The energy shifts of spectral features substantiate that replacing Se2- with P3- serves as hole doping, shedding light on the tunability of ZrP2-xSex. These findings on the electronic structure establish an essential basis for understanding the superconductivity in the AP2-xXx system.
- リンク情報
-
- DOI
- https://doi.org/10.1103/physrevb.105.195111
- URL
- http://harvest.aps.org/v2/journals/articles/10.1103/PhysRevB.105.195111/fulltext
- URL
- https://link.aps.org/article/10.1103/PhysRevB.105.195111
- Scopus
- https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85130081252&origin=inward
- Scopus Citedby
- https://www.scopus.com/inward/citedby.uri?partnerID=HzOxMe3b&scp=85130081252&origin=inward
- ID情報
-
- DOI : 10.1103/physrevb.105.195111
- ISSN : 2469-9950
- eISSN : 2469-9969
- ORCIDのPut Code : 112767802
- SCOPUS ID : 85130081252