Ginzburg-Landau Expansion and the Slope of the Upper Critical Field in Superconductors with Anisotropic Normal Impurity Scattering
arXiv:cond-mat/9706240 · doi:10.1134/1.558388
Abstract
Ginzburg-Landau expansion for superconductors with anisotropic and wave pairing is derived in the presence of anisotropic normal impurity scattering which makes pairing state more stable under disordering. It is demonstrated that the slope of the upper critical field in superconductors with wave pairing has nonlinear dependence on disorder, i.e. for the low anisotropic scattering rate it drops rather fast with concentration of normal impurities, but as anisotropy of scattering increases it features initial nonlinear growth, approaches a maximum and drops again, vanishing at the critical impurity concentration. In superconductors with anisotropic wave pairing grows, approaching the known asymptotic behavior, characteristic of usual isotropic case irrespective to the scattering anisotropy.
11 pages, 5 figures, RevTeX 3.0, 4 Postscript figure attached, Submitted to JETP