Abstract
We consider the effect of nonmagnetic impurities on the onset temperature for the -wave pairing in spin-fluctuation scenario for the cuprates. We analyze intermediate coupling regime when the magnetic correlation length and the dimensionless coupling is . In the clean limit, in this parameter range and weakly depends on and . We found numerically that this universal pairing scale is also quite robust with respect to impurities: the scattering rate needed to bring 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.
- Received 24 September 2009
DOI:https://doi.org/10.1103/PhysRevB.81.012508
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