POINT-CONTACTS BETWEEN THE HEAVY-FERMION SUPERCONDUCTOR UBE13 AND CONVENTIONAL SUPERCONDUCTORS

Metallic point-contacts between UBe13 and conventional superconductors (Ta, Nb, NbTi) behave like S - N - S junctions without Josephson coup ling, instead, the superconductivity in each electrode appears to be d estroyed individually by different critical currents. In particular, t he part of the I - V characteristics due to the UBe13-superconductivit y is almost indistinguishable from that of contacts against normal met als. In magnetic fields of a few Tesla the junctions show an anomalous behaviour: the UBe13 critical current increases with the field. This effect is absent in point-contacts with a normal metal counterelectrod e.