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arXiv · 0909.4580

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 non-magnetic 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, $T^* \approx 0.02 v_f/a$ 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 $Γ_{cr}$ needed to bring $T^*$ down to zero is about 4 times larger than in weak coupling, in good quantitative agreement with experiments. We provide analytical reasoning for this result.

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A. B. Vorontsov, Ar. Abanov, M. G. Vavilov, A. V. Chubukov. 2009-09-25. Reduced effect of impurities on the universal pairing scale in the cuprates. https://doi.org/10.1103/physrevb.81.012508

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