SUPERCONDUCTING PROPERTIES OF NIOBIUM-TITANIUM-NITRIDE THIN FILMS

A series of Nb–Ti–N films have been prepared, with various Nb/Ti ratios, by a high purity, reactive sputtering process. A maximum in transition temperature (at ∼ 15.5°K) has been obtained for a composition of ${\mathrm{Nb}}_{\text{0.5}}{\mathrm{Ti}}_{\text{0.5}}\mathrm{N}$ . Critical field and critical current measurements indicate a degradation in these properties with increasing titanium content, contrary to results reported previously.