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VOLUME 51 (1990) | ISSUE 9 | PAGE 468
Superconductivity of nonstoichiometric niobium carbide
Heat treatment of niobium carbide alters the state of its carbon sublattice and causes a significant change in the superconducting transition temperature. The electron pairing in this case might be due to an interaction of the conduction electrons with the local modes of tunneling configurations which arise upon a local restructuring of a small group of carbon atoms.