Electronic structure of Fe3O4 across the verwey transition

A. Chainani, T. Yokoya, T. Morimoto, T. Takahashi, S. Todo

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A study of the first-order Verwey transition in single-crystal Fe3O4 using high-resolution temperature dependent (100 - 300K) photoemission spectroscopy is reported. Fe3O4 exhibits a gap of ∼ 70 meV in the occupied part of the density of states(DOS) below the transition temperature, Tv = 122 K. On increasing the temperature above Tv, the gap in the DOS is closed thus establishing a metal-semiconductor transition. The Fe 3d derived features arising from Fe3+ (eg2) majority and Fe2+ (t2g1) minority spin states responsible for the transition, retain their character just above the transition but merge into a single feature by 300 K. Simultaneously, the DOS at EF increases systematically in the metallic phase. The results indicate a gradual change in the short-range order for T > Tv which gives rise to the non-metallic like electrical conductivity observed just above Tv.

Original languageEnglish
Pages (from-to)99-102
Number of pages4
JournalJournal of Electron Spectroscopy and Related Phenomena
Volume78
DOIs
Publication statusPublished - May 1996
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Radiation
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Spectroscopy
  • Physical and Theoretical Chemistry

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