Dependence of Superconducting Critical Temperature of A15-Type V[sub 3]Ga on Composition.

The composition dependence of the superconducting critical temperature T[sub c] has been investigated for A15-type V[sub 3]Ga compounds. The T[sub c] is determined by the specific heat and the magnetic flux transmission ratio through the sample and discussed in terms of the powder X-ray diffraction. The long-range order parameter and the lattice parameter of V[sub 3]Ga are evaluated quantitatively by the Rietveld method at each composition, which is evaluated exactly by the electron probe microanalysis (EPMA) measurements. The well-ordered homogeneous alloying structures. V[sub 1-x]Ga[sub x] compounds are found to have nearly the same T[sub c] as that for the stoichiometric composition between 0.23 ≤ x < 0.25. [ABSTRACT FROM AUTHOR]