Y. Takane et H. Ebisawa, NUMERICAL STUDY ON THE CONDUCTANCE OF NORMAL-SUPERCONDUCTOR CONTACTS, Journal of the Physical Society of Japan, 62(6), 1993, pp. 1844-1847
Conductance of normal-superconductor contacts with disorder in the nor
mal segment is studied numerically using a simple lattice model. When
the probability of the Andreev reflection is small, the ensemble-avera
ged conductance is shown to be suppressed by a magnetic field. It is a
lso found that the conductance is enhanced with an increase of randomn
ess in the normal segment in the weak disordered regime. These anomalo
us features disappear in the case of complete Andreev reflection.