Reduced effect of impurities on the universal pairing scale in the cuprates
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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.
author list (cited authors)
Vorontsov, A. B., Abanov, A. r., Vavilov, M. G., & Chubukov, A. V.
complete list of authors
Vorontsov, AB||Abanov, Ar||Vavilov, MG||Chubukov, AV