Physics – Condensed Matter – Superconductivity
Scientific paper
1997-03-08
Physics
Condensed Matter
Superconductivity
RevTex, 4 pages with 4 eps figures
Scientific paper
10.1103/PhysRevB.56.5108
A generalization of the Abrikosov-Gorkov equations for non-magnetic impurities in unconventional superconductors is proposed, including higher harmonics in the expansion of the momentum dependent gap function and a momentum dependent impurity scattering potential. This model is treated within a self-consistent calculation to obtain the electronic density of states, the optical conductivity, and the gap function in a two-dimensional d_{x^2-y^2}-wave superconductor. It is argued that momentum dependent scattering from the impurities may lead to extended gapless regions in the gap function centered around the nodes of the pure d_{x^2-y^2}-wave superconductor. The associated enhancement of the residual density of states may be responsible for the rapid decrease of T_c and the increase of the London penetration depth with hole doping observed in overdoped cuprate superconductors.
Balatsky Alexander V.
Haas Stephan
Rice Maurice T.
Sigrist Manfred
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