Specific heat ofV3GaHx

Abstract

Specific-heat measurements have been made on ${\mathrm{V}}_3\mathrm{Ga}{\mathrm{H}}_x$ for $x=0, 0.2, 1.4, \mathrm{and} 1.9$ in the temperature range 1.2-20 K. In addition to increased lattice parameter and depressed transition temperature with increased hydrogen concentrations, the Debye temperature increases and the electronic density of states drops, both dramatically. Decreased electron-phonon coupling is also indicated with hydrogenation.