Abstract
Low-temperature heat capacities from 1.5 to 20°K have been measured for several molybdenum carbides with closely related crystal structures. These carbides are found to have very similar thermodynamic and superconducting properties. This similarity, as well as their unusually high T c 's, can be explained by their related crystal structures. An experimental evaluation of the applicability of the GLAG theory (1) to these carbides shows that the upper critical field, H c2 , is limited by the Ginzburg-Landau κ l parameter, in which the coherence length is limited only by the electron mean free path.
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