Superconductivity of metallic glasses (Cu/sub 1-x/Ni/sub x/)33Zr67

This paper reports an investigation of the superconductivity of the (Cu/sub 1-x/Ni/sub x/)33Zr67 series metallic glasses. The critical temperature T/sub c/ and the upper perpendicular critical field H/sub c/2 are measured. The results show that these metallic glasses are weak-coupling superconductors. T/sub c/ is found to increase with increasing Ni concentration. The density of states at the Fermi level, N(0), is estimated using (dH/sub c/2/dT)/sub T//sub c/. The Varma-Dynes parameter is approximately a constant. A higher N(0) corresponds to a higher T/sub c/. The superconducting behavior is governed basically by N(0)