DISORDER EFFECT IN LOW-DIMENSIONAL SUPERCONDUCTORS

The quasiparticle density of states (DOS), the energy gap, the superfl uid density rho(s), and the localization effect in the s- and d-wave s uperconductors with non-magnetic impurity in two dimensions (2D) are s tudied numerically. For strong (unitary) scatters, we find that it is the range of the scattering potential father than the symmetry of the superconducting pairing which is more important in explaining the impu rity dependences of the specific heat and the superconducting transiti on temperature in Zn doped YBCO. The localization length is longer in the d-wave superconducting state than in the normal state, even in the vicinity of the Fermi energy.