Comparison of amorphous melt-spun and vapor-quenched Zr-Rh alloys

Amorphous Zr-Rh alloys produced by melt spinning have a higher superconducting transition temperature T_c than materials generated by r.f. cosputtering techniques. However, the temperature dependence of the upper critical field H_c²(T is consistent with the GLAG theory for both materials. The T_c differences, as well as variations in the electronic density of states, can be partially understood in terms of slight differences in the average density, perhaps due to the inclusion of Ar gas during sputtering.