Temperature-Dependent Soft X-ray Photoemission and Absorption Studies of Charge Disproportionation in La_<1-x>Sr_xFeO_3(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• We have measured the temperature dependence of the photoemission and x-ray absorption spectra of La_<1-x>Sr_xFeO_3 (LSFO) epitaxial thin films with x=0.67, where charge disproportionation (3Fe^<3.67+>→2Fe^<3+>+Fe^<5+>) resulting in long-range spin and charge ordering is known to occur below T_<CD>=190K. With decreasing temperature we observed gradual changes of the spectra with spectral weight transfer over a wide energy range of 〜5eV. Above T_<CD> the intensity at the Fermi level was relatively high compared to that below T_<CD> but still much lower than that in conventional metals. We also found a similar temperature dependence for x=0.4, and to a lesser extent for x=0.2. These observations suggest that a local charge disproportionation occurs not only in the x=0.67 sample below T_<CD> but also over a wider temperature and composition range in LSFO. This implies that the tendency toward charge disproportionation may be the origin of the unusually wide insulating region of the LSFO phase diagram.

• 社団法人日本物理学会の論文
• 2006-05-15

著者

• KAWASAKI Masashi

  Institute for Materials Research, Tohoku University

• Lippmaa Mikk

  The Institute For Solid State Physics The University Of Tokyo

• Lippmaa Mikk

  Institute Of Solid State Physics University Of Tokyo

• KUMIGASHIRA Hiroshi

  Department of Physics,Tohoku University

• Kawasaki M

  Institute For Materials Research Tohoku University

• FUJIMORI Atsushi

  Department of Physics and Department of Complexity Science and Engineering, University of Tokyo

• Kumagai M

  Materials And Structures Laboratory Tokyo Institute Of Technology

• Kawasaki M

  Institute For Materials Research (imr) Tohoku University

• Kawasaki Masashi

  Institute For Materials Research (imr) Tohoku University

• Koinuma H

  National Institute For Materials Science (nims)

• KOINUMA Hideomi

  Tokyo Institute of Technology

• OSHIMA Masaharu

  Department of Engineering, University of Tokyo

• Fujimori Atsushi

  Department Of Physics And Department Of Complexity Science And Engineering University Of Tokyo

• Kawasaki Masashi

  Department Of Applied Biological Science Tokyo Noko University

• Kumigashira Hiroshi

  Department Of Applied Chemistry The University Of Tokyo

• Kumigashira Hiroshi

  Department Of Applied Chemistry Graduate School Of Engineering The University Of Tokyo

• CHIKAMATSU Akira

  Department of Applied Chemistry, The University of Tokyo

• WADATI Hiroki

  Department of Physics and Department of Complexity Science and Engineering, University of Tokyo

• HASHIMOTO Ryuji

  Department of Applied Chemistry, University of Tokyo

• TAKIZAWA Masaru

  Department of Physics and Department of Complexity Science and Engineering, University of Tokyo

• KOINUMA Hideomi

  National Institute for Materials Science

• Hashimoto Ryuji

  Department Of Applied Chemistry University Of Tokyo

• Oshima Masaharu

  Dep. Of Applied Chemistry And Jst-crest The Univ. Of Tokyo

• Koinuma Hideomi

  Department Of Applied Physics Graduate School Of Engineering Nagoya University

• Koinuma Hideomi

  Crest Japan Science And Technology Corporation

• Koinuma Hideomi

  Department Of Industrial Chemistry Faculty Of Engineering University Of Tokyo

• Koinuma Hideomi

  Department Of Industrial Chemistry University Of Tokyo

• Fujimori Atsushi

  Department Of Complexity Science And Engineering And Department Of Physics University Of Tokyo

• Oshima Masaharu

  Department Of Applied Chemistry Graduate School Of Engineering The University Of Tokyo

• Kawasaki Masashi

  Institute For Chemical Research Kyoto University

• Chikamatsu Akira

  Graduate School Of Science The University Of Tokyo

• OSHIMA Masaharu

  Department of Applied Chemistry, University of Tokyo

• KUMIGASHIRA Hiroshi

  Department of Applied Chemistry, University of Tokyo

• KUMIGASHIRA Hiroshi

  Department of Applied Chemistry and JST-CREST, The University of Tokyo

• LIPPMAA Mikk

  Institute for Solid State Physics, University of Tokyo

• Wadati Hiroki

  Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T-1Z1, Canada

• LIPPMAA Mikk

  Institute for Solid State Physics, The University of Tokyo

• OSHIMA Masaharu

  Department of Applied Chemistry and JST-CREST, The University of Tokyo

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