Magnetic susceptibility of vanadium carbide

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Abstract
The magnetic susceptibility of single-crystal VC x (x = 0.76, 0.81, 0.84, 0.87) has been found to decrease sharply as x increases from 0.76, in qualitative agreement with the results of previous measurements made by Bittner and Goretzki on powder specimens. The present results, however, show a minimum near x=0.84 followed by a slight increase at x=0.87, and in this respect are similar to the observations of Borukhovich and his collaborators in their studies of the other Group V carbides NbC x and TaC x . This variation of the susceptibility is attributed primarily to the (Van Vleck) oribital paramagnetism, supporting the suggestion made previously by Froidevaux and Rossier. A simple model for the orbital paramagnetism in VC x is shown to account qualitatively for the observed variation with carbon content.