Abstract
The strongly different variation of the superconducting transition temperature, T c, observed from the A15 type compounds V 3Ga and Nb 3Ga as a function of the heat treatment has been correlated with the precise shapes of their corresponding phase fields at the vicinity of the stoichiometric composition. The change in T c for V 3Ga is related to LRO effects only, while combined compositional and LRO effects are present in the case of Nb 3Ga. These two contributions, which have been separated in the present work, determine the behavior of all high T c superconductors of the A15 phase.
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