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

A. B. Vorontsov, Ar Abanov, M. G. Vavilov, A. V. Chubukov

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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 ξ/a > 1 and the dimensionless coupling u is O (1). In the clean limit, T ≈ 0.02 vf /a in this parameter range and weakly depends on ξ and u. We found numerically that this universal pairing scale is also quite robust with respect to impurities: the scattering rate Γcr 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.

Original languageEnglish (US)
Article number012508
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number1
DOIs
StatePublished - Jan 29 2010
Externally publishedYes

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