Theory of Valence Transition in BiNiO3

Makoto Naka, Hitoshi Seo, Yukitoshi Motome

研究成果: Article

12 引用 (Scopus)

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Motivated by the colossal negative thermal expansion recently found in BiNiO3, the valence transition accompanied by the charge transfer between the Bi and Ni sites is theoretically studied. We introduce an effective model for Bi-6s and Ni-3d orbitals taking into account the valence skipping of Bi cations, and investigate the ground-state and finite-temperature phase diagrams within the mean-field approximation. We find that the valence transition is caused by commensurate locking of the electron filling in each orbital associated with charge and magnetic orderings, and the critical temperature and the nature of the transitions are strongly affected by the relative energy between the Bi and Ni levels and the effective electron-electron interaction in the Bi sites. The obtained phase diagram well explains the temperature- and pressure-driven valence transitions in BiNiO3 and the systematic variation of valence states for a series of Bi and Pb perovskite oxides.

元の言語English
記事番号056402
ジャーナルPhysical Review Letters
116
発行部数5
DOI
出版物ステータスPublished - 2016 2 5
外部発表Yes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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