Why is d-wave pairing in HTS robust in the presence of impurities?
arXiv:cond-mat/9612211 · doi:10.1016/S0038-1098(97)00395-5
Abstract
In the recent theory of strong correlations by Kulic and Zeyher it has been shown that by lowering doping concentration a forward peak in the charge scattering channel is developed. Accordingly, near the optimal doping the nonmagnetic scattering is pronounced in the d-channel and its effect on d-wave pairing is reduced. As a consequence, d-wave pairing is robust against defects and impurities, the order parameter keeps its d-wave shape for any scattering rate and the density of states becomes finite at the Fermi surface. For large doping scattering anisotropy parameter is small and d-wave loses its robustness. The theory is generally formulated for the bi-layer model by including: 1) intra- and inter-plane pairing; 2) intra- and inter-plane impurities.
Complete revision, 4 pages with 2 PS figures, RevTeX, submitted to Phys. Rev. Lett
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