Periodic Anderson Model with Degenerate Orbitals: Linearized Dynamical Mean Field Theory Approach

• Sato Ryota

  Department of Applied Physics, Osaka University

• Ohashi Takuma

  Department of Applied Physics, Osaka University

• Koga Akihisa

  Department of Applied Physics, Osaka University

• Kawakami Norio

  Department of Applied Physics, Osaka University

抄録

We investigate a multi-orbital extension of the periodic Anderson model with particular emphasis on electron correlations including orbital fluctuations. By means of a linearized version of the dynamical mean-field theory, we compute the renormalization factor, the density of states, the spectral gap and the local correlation functions for a given set of the intra- and inter-orbital Coulomb interactions as well as the Hund coupling. It is found that when a certain condition is met for the intra- and inter-orbital interactions for f electrons, orbital fluctuations are enhanced, thereby enlarging the Kondo insulating gap. This effect is suppressed in the presence of the Hund coupling. We also clarify how the Kondo insulator is continuously changed to the Mott insulator when electron correlations among conduction electrons are increased.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 73 (7), 1864-1869, 2004

  一般社団法人 日本物理学会

キーワード

• heavy fermions
• periodic Anderson model
• orbital degeneracy
• dynamical mean field theory

詳細情報

• CRID: 1390282679163931392
• NII論文ID: 110001954903
• NII論文ID: 210000104918
• NII論文ID: 130004538832
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.73.1864
• BIBCODE: 2004JPSJ...73.1864S
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7004405
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7004405
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.73.1864
• 本文言語コード: en
• データソース種別:
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• 抄録ライセンスフラグ: 使用不可