Abstract
Electronic, lattice and superconducting properties have been studied through low-temperature specific heat on both B2 systems V54-xRu46Osx and V54Ru46-xOsx, where a cubic-to-tetragonal transformation occurs upon cooling and shows a decisive correlation with superconductivity. An increase of the parameter x in V54-xRu46Osx, where the electron-atom ratio e/a increases linearly with x causing a rise of the transformation temperature TL, lowers the electronic specific heat coefficient gamma and the superconducting transition temperature Tc, while it gives no effect on the Debye temperature theta D. In contrast, an increase of x in V54Ru46-xOsx with e/a=6.38, where no transformation occurs, causes no variation of the values of gamma , Tc and theta D. The enhancement of superconductivity, which is accompanied by a decrease in TL as e/a is lowered, is mainly attributed to an increase of the electronic density of states rather than a softening of phonon modes.
Published Version
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