Pressure studies on the superconductor Mo3Sb7

The electrical resistivity (p(T)) and magnetization (M(T)) of the superconductor Mo3Sb7 (Tc = 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 Tsdw, which is revealed by a sharp jump in ρ(T) and a maximum in M(T) dependencies. With increasing pressure Tsdw decreases while Tc increases. The pressure dependencies of Tc and Tsdw can be understood on the basis of competition of the SDW and the superconducting states in this compound.