Gradual disappearance of the Fermi surface near the metal-insulator transition in La1-x Srx Mn O3 thin films

A. Chikamatsu, H. Wadati, H. Kumigashira, M. Oshima, A. Fujimori, M. Lippmaa, K. Ono, M. Kawasaki, H. Koinuma

研究成果: Article

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We report the observation of changes in the electronic structure of La1-x Srx Mn O3 (LSMO) across the filling-control metal-insulator (MI) transition by means of in situ angle-resolved photoemission spectroscopy (ARPES) of epitaxial thin films. The Fermi surface gradually disappears near the MI transition by transferring spectral weight from the coherent band near the Fermi level (EF) to the lower Hubbard band, whereas a pseudogap behavior also exists in the ARPES spectra in the close vicinity of EF for metallic LSMO. These results indicate that the spectral weight transfer derived from strong electron-electron interaction dominates the gap formation in LSMO associated with the filling-control MI transition.

元の言語English
記事番号201103
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
76
発行部数20
DOI
出版物ステータスPublished - 2007 11 30
外部発表Yes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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