Spin Fluctuations and Superconductivity in Mo 3 Sb 7

摘要: Temperature dependences of the magnetic susceptibility, specific heat, and electrical resistivity have been measured for ${\mathrm{Mo}}_{3}{\mathrm{Sb}}_{7}$ compound in 0.6--350 K range. This exhibits bulk superconductivity occurring at 2.25 follows Kadowaki-Woods relation, $A/{\ensuremath{\gamma}}^{2}=1.0\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}\text{ }\text{ }\ensuremath{\mu}\ensuremath{\Omega}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{cm}(\mathrm{K}\ifmmode\cdot\else\textperiodcentered\fi{}\mathrm{mol}/\mathrm{mJ}{)}^{2}$, as a heavy-fermion system does. We show, from experimental evidence theoretical argument, that can be classified coexistent superconductor-spin fluctuation system. The McMillan equation including paramagnon effects was found to give an accurate estimation transition temperature.