Signature of band inversion in the perovskite thin-film alloys BaS n1-x P bx O3

Junichi Shiogai, Takumaru Chida, Kenichiro Hashimoto, Kohei Fujiwara, Takahiko Sasaki, Atsushi Tsukazaki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Perovskite oxides ABO3 containing heavy B-site elements are a class of candidate materials to host topological metals with a large spin-orbit interaction. In contrast to the band insulator BaSnO3, the semimetal BaPbO3 is proposed to be a typical example with an inverted band structure, the conduction band of which is composed of mainly the O-2p orbital. In this paper, we exemplify a band-gap modification by systematic structural, optical, and transport measurements in BaSn1-xPbxO3 films. A sudden suppression of the conductivity and an enhancement of the weak antilocalization effect at x=0.9 indicate the presence of a singular point in the electronic structure as a signature of the band inversion. Our findings provide an intriguing platform for combining topological aspects and electron correlation in perovskite oxides based on band-gap engineering.

Original languageEnglish
Article number125125
JournalPhysical Review B
Volume101
Issue number12
DOIs
Publication statusPublished - 2020 Mar 15

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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