Magnetic Anisotropy and Hidden Martensitic Transition in V3Si

Magnetization, electrical resistivity and heat capacity have been measured on a single crystal V₃Si in the range of (2-25) K and in magnetic field up to 14 T. A different behavior of magnetization for two orientations of the crystal has been found. In one orientation the magnetization displays a clear ferromagnetic character and below T_c coexistence of ferro-magnetism and superconductivity with a peak-effect in the vicinity of upper critical field H_c2. The specific heat measurements show sharp lambda anomaly corresponding to a transition to superconductive state and an additional anomaly around 15 K when applied field suppresses the superconductivity below this temperature.