SUPERCONDUCTING PROPERTIES OF AMORPHOUS Zr-Nb-Ge ALLOYS.

A superconducting amorphous phase with high strength and ductility has been found in a wide composition range from 0 to 65 at%Nb and from 11 to 21 at%Ge. The upper critical magnetic field and critical current density for a Zr//4//5Nb//4//0Ge//1//5 alloy were 2. 47 multiplied by 10**6 Am** minus **1 and 2. 40 multiplied by 10**6 Am** minus **2, respectively, at 1. 70 K in the absence of applied field. The upper critical field gradient at T//c, and the electrical resistivity at 4. 2 K decreased from 2. 29 multiplied by 10**6 to 1. 31 multiplied by 10**6 Am** minus **1 K** minus **1 and 2. 70 to 2. 00 mu OMEGA m with the amount of Nb. The GL parameter and coherence length were estimated to be 64-101 and about 8. 2 nm. The alloys are ″dirty″ type-II superconductors having a weak flux pinning force.