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Reduction ofTcdue to Impurities in Cuprate Superconductors - MaRDI portal

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Reduction ofTcdue to Impurities in Cuprate Superconductors

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Publication:4659033

DOI10.1143/JPSJ.73.2219zbMATH Open1071.82583arXivcond-mat/0403354MaRDI QIDQ4659033

Author name not available (Why is that?)

Publication date: 21 March 2005

Published in: (Search for Journal in Brave)

Abstract: 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 Tc 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 Tc by impurities. We find that 'pseudogap breaking' by impurities plays the essential role in underdoped cuprate and suppresses the Tc reduction due to the superconducting (SC) fluctuation.


Full work available at URL: https://arxiv.org/abs/cond-mat/0403354



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