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In this study the compositional dependence of Tc was investigated for A15 type V3Ga compound which shows a comparatively high value of Tc among metallic superconductors, and the results were discussed in terms of crystal structure determined by X ray diffraction. It has been found that V3Ga compounds keep the same Tc in the Vrich compositional range as that at the stoichiometric composition. This result is quite different from the previously reported ones, and is mainly attributed to the difference in annealing time. Detailed analysis by Xray diffraction for different compositions of V3Ga proved that the long range ordering for the V site is strongly related to the compositional dependence of Tc rather than the total long range ordering of V3Ga. About compositional dependence of lattice parameter, lattice constant a increases as Gacomposition increases. In the Vrich compositional range, a increases a little. These have been also discussed on the basis of the results of lattice spacing. It is concluded that the Tc of V3Ga is associated with both the long range ordering of V site and the atomic spacing of the Vchain.

Compositional Dependence of Superconducting Transition Temperature and Long Range Order Parameter in A15 Type V3Ga

Compositional Dependence of Superconducting Transition Temperature and Long Range Order Parameter in A15 Type V₃Ga