Spin fluctuations and superconductivity in Mo3Sb7

Temperature dependences of the magnetic susceptibility, specific heat, and electrical resistivity have been measured for the Mo3Sb7 compound in the 0.6-350 K range. This compound exhibits bulk superconductivity occurring at 2.25 K and follows the Kadowaki-Woods relation, A/gamma(2)=1.0x10(-5) mu Omega center dot cm(K center dot mol/mJ)(2), as a heavy-fermion system does. We show, from experimental evidence and theoretical argument, that Mo3Sb7 can be classified as a coexistent superconductor-spin fluctuation system. The McMillan equation including paramagnon effects was found to give an accurate estimation of the transition temperature.