Low-field magnetization measurements have been made at 4.2°K on thin-film and bulk NbN samples using a vibrating-sample Foner magnetometer. These data can be used to calculate the upper critical field, Hc2, without having to resort to resistivity data, which, particularly in the case of NbN, yield very anomalous results. In the present work the experimental value of Hc1 is obtained from the magnetization curves and Hc2 is then calculated using the GLAG equations. These calculations and the significance of the Pauli spin paramagnetism and spin-orbit scattering in these materials are discussed.
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Mathur et al. (1972) studied this question.
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