Superconducting parameters of aluminum-lithium alloys

Superconducting transition temperatures T$_{c}$ near 1 K of single-phase fcc aluminum-lithium alloys, with 0 to 10 at.{\%} Li, have been determined through ac susceptibility data. Earlier calorimetric measurements above 2 K on the same samples yielded the Debye temperature $\theta _{D}$ and the density of states at Fermi level N(0) from the lattice specific heat coefficient and the electronic specific heat coefficient, respectively. Following the modified BCS expression, T$_{c}$ = 0.85$\theta _{D}$exp[-1/N(0)V], such experimentally derived T$_{c}$, $\theta _{D }$and N(0) values for each sample provide a measure of the electron-phonon interaction parameter V, which plays central roles in inducing the traditional superconductivity. Its value increases monotonically from 0.611 to 0.710 eV for 0 to 10 at.{\%} Li.