Abstract
The crystal structure and electrical properties of Li 1− x NbO 2 have been investigated using XRD and electrical measurements. Li 1− x NbO 2 crystallizes in a hexagonal layered structure. A superconducting transition with T c = 14–17 K was observed. However, this transition significantly depends on the Li content in compound. It implies that the superconductivity in Li 1− x NbO 2 is induced by Li-removal from the near stoichiometric non-superconducting phase. Li 1− x NbO 2 shows a metallic characterization for Li content being more than 0.90 and a superconducting behavior for Li content in the range of 0.50–0.60, respectively. The lattice parameters and unit cell volume of Li 1− x NbO 2 compound increase with decreasing Li content from 0.90 to 0.50. And the upper critical field H c2(0) is 12.1 ± 0.5 T.
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