QUASI-PARTICLE TRANSPORT AT THE INTERFACE BETWEEN THE NORMAL CONDUCTOR AND THE D-WAVE SUPERCONDUCTOR

We modify the Blender, Tinkham and Klapwijk theory to calculate the di fferential conductance of the interface between the normal conductor a nd the d-wave superconductor at zero temperature. The differential con ductance is calculated as a function of the bias voltage in the absenc e or presence of the barrier potential at the interface. It is shown t hat the behavior of the conductance in the case of the d-wave symmetry is quite different from that in the case of the s-wave symmetry. Thus the information of the symmetry for the Cooper pair should be obtaine d from the quasiparticle transport phenomena at the normal-superconduc ting microconstriction.