Pauli Limiting and the Possibility of Spin Fluctuations in theA15Superconductors

Abstract

From the critical-field data on the strongly Pauli limited superconductor ${\mathrm{V}}_3$Ga it is shown that large electron-electron interactions (and their associated spin fluctuations) may play an important role in the superconductivity of the $A15\mathrm{}$ superconductors. This possibility is shown to be consistent with existing $T_c$, heat-capacity, and spin-susceptibility data on several $A15\mathrm{}$ superconductors.