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 language | English (US) |
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Article number | 012508 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 81 |
Issue number | 1 |
DOIs | |
State | Published - Jan 29 2010 |
Externally published | Yes |