Reduction of T_c due to Impurities in Cuprate Superconductors(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)
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概要
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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.
- 社団法人日本物理学会の論文
- 2004-08-15
著者
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YAMADA Kosaku
Department of Physics, Kyoto University
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Kudo Kiwamu
Department Of Phsyics Kyoto University
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Yamada Kosaku
Department Of Mechanical Engineering Faculty Of Engineering Kagoshima University
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Yamada Kosaku
Department Of Phsyics Kyoto University
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