Ginzburg-Landau Equations for (d+s)-Wave Superconductors in a Non-Fermi Liquid

The Ginzburg-Landau equations are microscopically derived for an anisotropic (d + s)-wave superconductor by assuming a non-Fermi-liquid normal state characterized by a nonvanishing exponent α. The transition temperature T_c as functions of α and the anisotropic parameter g which measures the ab anisotropy is studied. It is found that the anisotropic effect, which results in the enhancement of T_c and the nonzero bulk value of the s-wave order parameter, is strengthened due to the non-Fermi behavior.