Magnetization Studies on Some Superconducting Transition Metal Solutions

Abstract

Magnetic induction measurements have been carried out on a number of homogeneous solid solutions of the transition metals Nb, V, and Ta with solutes of column IV A and VI A. The hysteresis effects are large when the solute atoms are large correlating with increase in critical temperature, lattice parameter, and critical current. When the solute atom size is the same or smaller than the parent atom the hysteresis is small, similar to the magnetic behavior observed in all the alloys when in a finely divided state. This variation approaches that predicted by negative surface energy models.