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Reduced effect of impurities on the universal pairing scale in the cuprates

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Title: Reduced effect of impurities on the universal pairing scale in the cuprates
Author: Vorontsov, A. B.; Abanov, Artem; Vavilov, M. G.; Chubukov, A. V.
Abstract: We consider the effect of nonmagnetic impurities on the onset temperature T* for the d-wave pairing in spin-fluctuation scenario for the cuprates. We analyze intermediate coupling regime when the magnetic correlation length xi/a>1 and the dimensionless coupling u is O(1). In the clean limit, T*approximate to 0.02v(f)/a in this parameter range and weakly depends on xi and u. We found numerically that this universal pairing scale is also quite robust with respect to impurities: the scattering rate Gamma(cr) needed to bring T* down to zero is about four times larger than in weak coupling, in good quantitative agreement with experiments. We provide analytical reasoning for this result.
Description: Journals published by the American Physical Society can be found at http://journals.aps.org/
Publisher: American Physical Society
Department: Physics and Astronomy
URI: http://dx.doi.org/10.1103/PhysRevB.81.012508
Date: 2010


A. B. Vorontsov, Artem Abanov, M. G. Vavilov and A. V. Chubukov. Phys.Rev.B 81 012508 2010."Copyright (2010) by the American Physical Society."

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