Electronic properties, phonon densities of states and superconductivity in Nb1-xVxN

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Abstract
The authors present experimental results for the low-temperature specific heat, the magnetic susceptibility and the phonon density of states in the pseudobinary system Nb1-xVxN. This system is known to exhibit a pronounced minimum of the superconducting transition temperature around x approximately 0.5. They discuss the possible origins of this minimum. While a significant minimum in the electron-phonon coupling strength is not supported by the authors data from inelastic neutron scattering, the consideration of spin fluctuations offers a consistent description of the experimental findings.