Superconducting and normal state properties of Li1+xTi2−xO4 spinel compounds. I. Preparation, crystallography, superconducting properties, electrical resistivity, dielectric behavior, and magnetic susceptibility
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LiTi2O4 is one end member of the homogeneity range of the spinel phase Li1+xTi2−xO4 (0≤x≤1/3) and is superconducting at temperatures up to 13.7 K. Various measurements were carried out in order to characterize the superconducting and normal state properties of LiTi2O4 and of other compositions within the homogeneity range of the spinel phase. These measurements establish LiTi2O4 as ad-band superconductor and show thatTc decreases to <1.5 K forx≳0.1. This disappearance of superconductivity with increasingx was found to be correlated with anomalous changes in the lattice parameter with composition, and, from electrical resistivity measurements, is tentatively attributed to the occurrence of a composition-induced metal-semiconductor transition atx≈0.1. The metallic character of LiTi2O4 and the composition dependence of the observed electrical properties are shown to follow from crystallographic considerations.
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