High-resolution photoemission spectroscopy of the Verwey transition in Fe3O4

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

研究成果: Article査読

109 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)17976-17979
ページ数4
ジャーナルPhysical Review B
51
24
DOI
出版ステータスPublished - 1995

ASJC Scopus subject areas

  • 凝縮系物理学

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