Perturbation Theory on the Superconductivity of Heavy Fermion Superconductors CeIr_<i>x</i>Co_1-<i>x</i>In₅

• Nisikawa Yunori

  Department of Physics, Kyoto University, Kyoto 606-8502

• Ikeda Hiroaki

  Department of Physics, Kyoto University, Kyoto 606-8502

• Yamada Kosaku

  Department of Physics, Kyoto University, Kyoto 606-8502

書誌事項

タイトル別名

• Perturbation Theory on the Superconductivity of Heavy Fermion Superconductors CeIrxCo1-xIn5.

抄録

We reformulate the Éliashberg's equation for the superconducting transition within the quasi-particle description, which takes account of the heavy electron mass. We discuss the superconductivity of CeIr_xCo_1-xIn₅ by using such a renormalized formula. On the basis of an effective two-dimensional Hubbard model which represents the most heavy quasi-two dimensional Fermi surface with ƒ-character of CeIr_xCo_1-xIn₅, both normal and anomalous self-energies are calculated up to third order with respect to the renormalized on-site repulsion U between quasi-particles. The superconducting transition temperature is obtained by solving the Éliashberg's equation. Reasonable transition temperatures are obtained for moderately large U. It is found that the momentum and frequency dependence of spin fluctuations given by RPA-like terms gives rise to the d-wave pairing state, while the vertex correction terms are important for obtaining reasonable transition temperatures and for differentiating n-dependence of T_c. These obtained results seem to explain the x-dependence of T_c in CeIr_xCo_1-xIn₅ and confirm the usefulness of the perturbation theory with respect to U.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 71 (4), 1140-1147, 2002

  一般社団法人 日本物理学会

キーワード

• heavy fermion systems
• electron correlation
• Ce(Ir,Co,Rh)In<FONT SIZE="-1"><SUB>5</SUB></FONT>
• superconducting transition temperature
• perturbation approach
• vertex correction

詳細情報

• CRID: 1390282679160995968
• NII論文ID: 210000103637
• NII論文ID: 110001971687
• NII論文ID: 130004538192
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.71.1140
• BIBCODE: 2002JPSJ...71.1140N
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 6138947
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6138947
• Web Site: https://journals.jps.jp/doi/pdf/10.1143/JPSJ.71.1140
• 本文言語コード: en
• データソース種別:
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  • CiNii Articles
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