Superconductivity of proton-irradiatedV3Si

Bulk samples of ${\mathrm{V}}_3$Si were homogeneously irradiated by 35-MeV protons. Superconducting critical temperatures $T_c$, residual resistivities ${\rho }_0$, and upper critical fields $H_{c2\mathrm{}}$ were measured for magnetic fields up to 14 T and temperatures from 1.4 K up to $T_c$. The observed temperature dependence of $H_{c2\mathrm{}}$ is consistent with strong paramagnetic limiting and small spin-orbit scattering. Based on our collected data, estimates are provided for the electron-phonon coupling parameter $\lambda$ and the band density of states $N\left(0\right)\mathrm{}$. These estimates suggest that for radiation-damaged ${\mathrm{V}}_3$Si a general relation of the form $\lambda =AN\left(0\right)-BN{\mathrm{}\left(0\right)\mathrm{}}^2$ exists, where $A$ and $B$ are positive constants.