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SEM micrographs of superconducting niobium nitride nanowires and nanoribbons synthesized by annealing nanostructure precursors in flowing ammonia gas at for . Images at low and high magnifications are presented in (a) and (b), respectively.
(Color online) Structural and magnetization analyses of the niobium nitride nanostructures synthesized at various annealing temperatures. (a) Powder x-ray diffraction patterns and (b) magnetization vs temperature curves (measured at ).
(Color online) Four-probe transport measurements of individual niobium nitride nanowires measured with a current of . (a) Zero field vs curves of three nanowires (denoted samples A, B, and C). Inset to (a) contains phase diagrams of sample B as prepared (open circles) and exposed to air for (open triangles). (b) and (c) are curves at various fixed temperatures and zero-field curves at various fixed temperatures for sample B, respectively. Inset to (c) presents the temperature dependence of the current at which the voltage increases abruptly.
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