論文

査読有り
2015年12月

Temperature Dependence of Magnetically Active Charge Excitations in Magnetite across the Verwey Transition

PHYSICAL REVIEW LETTERS
  • M. Taguchi
  • A. Chainani
  • S. Ueda
  • M. Matsunami
  • Y. Ishida
  • R. Eguchi
  • S. Tsuda
  • Y. Takata
  • M. Yabashi
  • K. Tamasaku
  • Y. Nishino
  • T. Ishikawa
  • H. Daimon
  • S. Todo
  • H. Tanaka
  • M. Oura
  • Y. Senba
  • H. Ohashi
  • S. Shin
  • 全て表示

115
25
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevLett.115.256405
出版者・発行元
AMER PHYSICAL SOC

We study the electronic structure of bulk single crystals and epitaxial films of Fe3O4. Fe2p core level spectra show clear differences between hard x-ray (HAX) and soft x-ray photoemission spectroscopy (PES). The bulk-sensitive spectra exhibit temperature (T) dependence across the Verwey transition, which is missing in the surface-sensitive spectra. By using an extended impurity Anderson full-multiplet model-and in contrast to an earlier peak assignment-we show that the two distinct Fe species (A and B site) and the charge modulation at the B site are responsible for the newly found double peaks in the main peak above T-V and its T-dependent evolution. The Fe 2p HAXPES spectra show a clear magnetic circular dichroism (MCD) in the metallic phase of magnetized 100-nm-thick films. The model calculations also reproduce the MCD and identify the contributions from magnetically distinct A and B sites. Valence band HAXPES shows a finite density of states at E-F for the polaronic half metal with a remnant order above TV and a clear gap formation below TV. The results indicate that the Verwey transition is driven by changes in the strongly correlated and magnetically active B-site electronic states, consistent with resistivity and optical spectra.

リンク情報
DOI
https://doi.org/10.1103/PhysRevLett.115.256405
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000366728600008&DestApp=WOS_CPL
ID情報
  • DOI : 10.1103/PhysRevLett.115.256405
  • ISSN : 0031-9007
  • eISSN : 1079-7114
  • Web of Science ID : WOS:000366728600008

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