Superconducting properties of In doped ZrNi2Ga1−xInx

Abstract We report on the effect of In doping on the superconducting properties of ZrNi 2 Ga 1− x In x ( x  = 0.0.05, 0.10, 0.15) Heusler alloys. While the samples with x 1 structure, small concentrations of ZrGa 2 -type orthorhombic secondary phases formed on the samples with x  ≥ 0.1. Electrical resistivity and dc magnetization measurements showed that the superconducting transition temperature of the compounds decreased with increasing In concentration. All samples showed paramagnetic ordering above their respective superconducting transition temperature. The observations suggest that for x ∼0.45 the ZrNi 2 Ga 1− x In x compound might exhibit a quantum phase transition.