Temperature-Dependent Soft X-ray Photoemission and Absorption Studies of Charge Disproportionation in La1-xSrxFeO3

• Wadati Hiroki

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

• Chikamatsu Akira

  Department of Applied Chemistry, 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

• Kumigashira Hiroshi

  Department of Applied Chemistry, University of Tokyo

• Fujimori Atsushi

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

• Oshima Masaharu

  Department of Applied Chemistry, University of Tokyo

• Lippmaa Mikk

  Institute for Solid State Physics, University of Tokyo

• Kawasaki Masashi

  Institute for Materials Research, Tohoku University

• Koinuma Hideomi

  National Institute for Materials Science

書誌事項

タイトル別名

• Temperature-Dependent Soft X-ray Photoemission and Absorption Studies of Charge Disproportionation in La1−xSrxFeO3
• Temperature-Dependent Soft X-ray Photoemission and Absorption Studies of Charge Disproportionation in La_1-<i>x</i>Sr_<i>x</i>FeO₃

抄録

We have measured the temperature dependence of the photoemission and x-ray absorption spectra of La_1−xSr_xFeO₃ (LSFO) epitaxial thin films with x=0.67, where charge disproportionation (3Fe^3.67+→2Fe³⁺+Fe⁵⁺) resulting in long-range spin and charge ordering is known to occur below T_CD=190 K. With decreasing temperature we observed gradual changes of the spectra with spectral weight transfer over a wide energy range of ∼5 eV. 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.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 75 (5), 054704-, 2006

  一般社団法人 日本物理学会

キーワード

• La<SUB>1−<I>x</I></SUB>Sr<I><SUB>x</SUB></I>FeO<SUB>3</SUB>
• photoemission spectroscopy
• thin films
• charge disproportionation
• temperature dependence
• spectral weight transfer
• wide insulating region

詳細情報

• CRID: 1390001204190444416
• NII論文ID: 110004702332
• NII論文ID: 210000106154
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.75.054704
• BIBCODE: 2006JPSJ...75e4704W
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7908342
• Web Site: http://id.ndl.go.jp/bib/7908342
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7908342
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.75.054704
• 本文言語コード: en
• データソース種別:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• 抄録ライセンスフラグ: 使用不可