Unusual superconducting behavior in HfV2Ga4

Abstract Bulk superconductivity in HfV 2 Ga 4 with critical temperature close to 4.1 K was determined via magnetic susceptibility, electrical resistivity and specific heat measurements. Both the upper and lower critical field dependence with reduced temperature ( T / T c ) exhibit non-conventional behavior. The electronic component of specific heat shows a double-jump, the first close to T c and the other close to 0.75 T c . We speculate about the nature of the douple jump observed in specific heat considering two plausable scenarios: bulk inhomogeneities and the existence of a second gap.