UNUSUAL SUPERCONDUCTING PHENOMENON IN CERU2 - EFFECTS OF ND SUBSTITUTIONS

Results are reported of the effects of Nd substitutions, on the recent ly discovered anomalous superconducting behaviour near the H-C2(T) lin e of the C15-Laves phase compound CeRu2. Small amount of Nd-doping enh ances both the T-C and H-C2 substantially. while retaining the anomalo us superconducting behaviour (observed in good single crystals of pure CeRu2) with all its characteristic features. These results provide cl ear indication that: (1) the enhanced magnetic susceptibility is playi ng a very crucial role in the anomalous superconducting behaviour of C eRu2; (2) the large electronic mean free path is not a stringent condi tion for the observation of such an anomalous behaviour.