Reduction of<i>T</i>_cdue to Impurities in Cuprate Superconductors

• Kudo Kiwamu

  Department of Physics, Kyoto University

• Yamada Kosaku

  Department of Physics, Kyoto University

書誌事項

タイトル別名

• Reduction of Tc due to Impurities in Cuprate Superconductors

抄録

In order to explain how impurities affect the unconventional superconductivity, we study non-magnetic impurity effect on the transition temperature using on-site U Hubbard model within a fluctuation exchange (FLEX) approximation. We find that in appearance, the reduction of T_c roughly coincides with the well-known Abrikosov–Gor’kov formula. This coincidence results from the cancellation between two effects; one is the reduction of attractive force due to randomness, and another is the reduction of the damping rate of quasi-particle arising from electron interaction. As another problem, we also study impurity effect on underdoped cuprate as the system showing pseudogap phenomena. To the aim, we adopt the pairing scenario for the pseudogap and discuss how pseudogap phenomena affect the reduction of T_c by impurities. We find that ‘pseudogap breaking’ by impurities plays the essential role in underdoped cuprate and suppresses the T_c reduction due to the superconducting (SC) fluctuation.

収録刊行物

• Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ

  Ｊｏｕｒｎａｌ　ｏｆ　ｔｈｅ　Ｐｈｙｓｉｃａｌ　Ｓｏｃｉｅｔｙ　ｏｆ　Ｊａｐａｎ 73 (8), 2219-2231, 2004

  一般社団法人 日本物理学会

キーワード

• high-<I>T</I><SUB>c</SUB> cuprates
• impurity effect
• fluctuation exchange
• superconducting fluctuation
• pseudogap

詳細情報

• CRID: 1390282679163735168
• NII論文ID: 110001954959
• NII論文ID: 210000104980
• NII書誌ID: AA00704814
• DOI: 10.1143/jpsj.73.2219
• BIBCODE: 2004JPSJ...73.2219K
• ISSN: 13474073
• ISSN: 00319015
• NDL書誌ID: 7052110
• Web Site: http://id.ndl.go.jp/bib/7052110
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I7052110
• Web Site: http://journals.jps.jp/doi/pdf/10.1143/JPSJ.73.2219
• 本文言語コード: en
• データソース種別:
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