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 ferromagnetism 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.