Thermodynamic and far-infrared properties ofV3Si calculated from tunneling results for the Eliashberg functionα2F and Coulomb pseudopotential parameterμ/emph>

Abstract

The superconducting thermodynamic properties of ${\mathrm{V}}_3$Si are calculated with the use of the tunneling results of Bangert, Geerk, and Schweiss (λ=2.21, ${\mu }^{\mathrm{*}}$=1.13) and those of Kihlstrom (λ=0.9, ${\mu }^{\mathrm{*}}$=0.1). It is found that Kihlstrom’s result gives a good description of the thermodynamics, while the ${\alpha }^2$F and the ${\mu }^{\mathrm{*}}$ of Bangert et al. do not. This implies that ${\mu }^{\mathrm{*}}$ is small and so spin fluctuations do not play a significant role. We also find that the tunneling ${\alpha }^2$F with 0.8≤λ≤2.21 does not describe well, within the standard theory, the observed far-infrared behavior of ${\mathrm{V}}_3$Si.