Superconductivity of niobium nitride single crystals after implantation of carbon and nitrogen |
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Authors: | O. Meyer E. Friedland B. Scheerer |
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Affiliation: | Kernforschungszentrum Karlsruhe, Institut für Angewandte Kernphysik I, 7500 Karlsruhe, Postfach 3640, Federal Republic of Germany |
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Abstract: | Single crystals of δ-NbN0.85 with a superconducting transition temperature Tc of 14.3 K were implanted with nitrogen and carbon ions at room temperature and subsequently annealed at high temperatures. Implantation was also performed at high substrate temperatures. After implantation at about 920°C maximum Tc-values of 16.5 and 17.8 K were obtained with N- and C-ions respectively. Disorder observed after room temperature implantation consisted of displaced Nb-atoms which could not be completely annealed in an isochromous annealing process up to 1000°C. For annealing temperatures above 1100°C nitrogen diffusion out of the implanted layers resulted in a reduction of Tc. |
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