Superconducting Properties of CeRu₂ Single Crystal

Abstract

We have grown single crystals of superconductor CeRu₂ by a zone melting method, on which we have measured the lower and upper superconducting critical fields. They are estimated as 250-400, Oe and 74, kOe at 0, K, respectively. The upper critical field H_c2 is slightly anisotropic, 64.8, kOe for the field along the ‹ 100› direction and 65.6, kOe for ‹ 110› at 1.5, K. We have also observed a characteristic feature in the superconducting mixed state.