Change in the electronic structure of the bismuth chalcogenide superconductor CsBi4-xPbxTe6 by dissociation of the bismuth dimers

Hiroyuki Okazaki, Kensei Terashima, David Billington, Keiji Iwata, Takanori Wakita, Masashi Tanaka, Yoshihiko Takano, Yuji Muraoka, Takayoshi Yokoya

Research output: Contribution to journalArticlepeer-review

Abstract

CsBi4-xPbxTe6 is synthesized and the superconductivity associated with the structural transition from Pb substitution is studied. Photoemission spectroscopy measurements are performed in order to elucidate the relationship between the electronic structure and the occurrence of the superconductivity. When Bi is substituted with Pb, an electron doping-like change in the electronic structure is directly observed which is contrary to the naive expectation of hole doping. This observation is consistent with band structure calculations and appears to be a unique characteristic of CsBi4-xPbxTe6 because of the dissociation of Bi dimers upon Pb substitution. These results indicate that it may be possible to control the electron and hole doping via manipulating the Bi dimers through Pb substitution.

Original languageEnglish
Article number145501
JournalJournal of Physics Condensed Matter
Volume32
Issue number14
DOIs
Publication statusPublished - Apr 3 2020

Keywords

  • bismuth chalcogenide
  • electronic structure
  • photoemission spectroscopy
  • superconductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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