In this paper we argue that spin fluctuations prevent VN from being a superconductor with a transition temperature of about 30 K instead of the experimental value of 8.6 K. Thus, besides V and Nb for which similar results have been reported recently, VN provides a further and even more pronounced example for spin-fluctuation-limited high-Tc superconductivity. Our results are obtained from microscopic calculations of Tc for the refractory compounds TiN, ZrN, VN, and NbN and from magnetic susceptibility data. Among these four compounds VN is exceptional in exhibiting both a large theoretical overestimate of Tc, if spin fluctuations are omitted, and a high magnetic susceptibility. Incorporating spin fluctuations within the theory of Berk and Schrieffer, the theoretical value of Tc can be brought into agreement with experiment. Calculations of the magnetic susceptibility and of Tc in nonstoichiometric VNₓ ($0.75<~x<~1.0$) and their comparison to experimental results of Ajami and MacCrone provide further support for our ideas.
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Rietschel et al. (1980) studied this question.
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