Electronic structure of Fe3O4 across the verwey transition

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

研究成果: Article同行評審

18 引文 斯高帕斯(Scopus)

摘要

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.

原文English
頁(從 - 到)99-102
頁數4
期刊Journal of Electron Spectroscopy and Related Phenomena
78
出版狀態Published - 1996 五月

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 輻射
  • 原子與分子物理與光學
  • 凝聚態物理學
  • 光譜
  • 物理與理論化學

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