High-resolution photoemission spectroscopy of the Verwey transition in Fe3O4

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

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Abstract

We study the first-order Verwey transition in single-crystal Fe3O4 using high-resolution temperature-dependent (100-300 K) photoemission spectroscopy. The near-Fermi-level (EF) spectrum exhibits a clear gap of ∼70 meV in the occupied part of the density of states (DOS) in the low-temperature semiconducting phase. The gap is closed above the transition temperature TV=122 K, 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 the existence of, and a gradual change in, the short-range order for T>TV, which causes the nonmetalliclike electrical conductivity observed just above TV.

Original languageEnglish
Pages (from-to)17976-17979
Number of pages4
JournalPhysical Review B
Volume51
Issue number24
DOIs
Publication statusPublished - Jan 1 1995
Externally publishedYes

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ASJC Scopus subject areas

  • Condensed Matter Physics

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