INVESTIGATION OF SUPERCONDUCTING GAP IN CeRu₂

Abstract

We lave investigated tie superconducting gap of CeRaz by point-contact spectroscopy and obtained its magnetic field dependences. The expeiiments were performed both for single and polycrystals. Tne superconducting gap value is up to 30 % greater for the single crystal than in the polycrystaUine CeJUi-The gap decreases almost linearly with the increasing field and vanishes at the characteristic field H* close to the irreversibility one. For the single crystalline sample there are some deviations from linear behaviour of the gap in the region of He". Zero-bias maximum growth of differential resistance was often observed above Ht*.