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The A15 structure of superconductors is a prototypical type-II superconductorthat has generated considerable interest since the early history ofsuperconducting materials. This paper discusses the superconducting propertiesof previously unreported V3-xCoxSi alloys. It is found that the latticeparameter decreases with increasing cobalt-doped content and leads to anincreased residual resistivity ratio (RRR) value of the V3-xCoxSi system.Meanwhile, the superconducting transition temperature (Tc) cobalt-dopedcontent. Furthermore, the fitted data show that the increase of cobalt-dopedcontent also reduces the lower/upper critical fields of the V3-xCoxSi system.Type-II superconductivity is demonstrated on all V3-xCoxSi samples. With higherCo-doped content, V3-xCoxSi alloys may have superconducting and structuralphase transitions at low-temperature regions. As the electron/atom (e/a) ratioincreases, the Tc variation trend of V3Si is as pronounced as in crystallinealloys and monotonically follows the trend observed for amorphoussuperconductors.

Superconductivity in the cobalt-doped V3Si A15 intermetallic compound