Pressure studies on the superconductor Mo₃Sb₇

The electrical resistivity (p(T)) and magnetization (M(T)) of the superconductor Mo₃Sb₇ (T_c = 2.2 K) has been measured under pressures up to 22 kbar and at temperatures from 0.4 to 80 K. Hydrostatic pressure is found to show up the spin-density wave state below T_sdw, which is revealed by a sharp jump in ρ(T) and a maximum in M(T) dependencies. With increasing pressure T_sdw decreases while T_c increases. The pressure dependencies of T_c and T_sdw can be understood on the basis of competition of the SDW and the superconducting states in this compound.