Superconductivity of some transition metal compounds |
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Authors: | ANørlund Christensen SE Rasmussen G Thirup |
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Institution: | Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark |
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Abstract: | Single crystals of niobium carbonitride were made by zone melting growth methods and single crystals of γ-NbN and δ-NbN by zone annealing crystal growth. The crystals are nonstoichiometric in contrast to the niobium carbonitride or niobium nitride prepared in reaction with nitrogen gas and niobium-niobium carbide mixtures and niobium metal, respectively. The transition temperature for superconductivity (Tc) decreases with increasing deviation from stoichiometry, and a determination of Tc is a nondestructive determination of this deviation. An instrument using the Wheatstone bridge principle is described and Tc values are listed for some nonstoichiometric single crystals of niobium carbonitride and niobium nitride. |
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