Abstract
New experimental results are reported on spinel LiTi2O4, and the related mixed valent systems Li1+xTi2−xO4 and Li1−xMg x Ti2O4 characterized by distinct Ti3+/Ti4+ ratios ( 1 in the latter). Specific heat data and transport properties show the high quality of the samples prepared by new routes. It is emphasized that, as far the specific heat data are concerned, the stoichiometric compound (withT c =12.4 K) satisfies BCS predictions in the weak coupling limit. Conversely, the mechanism of superconductivity is shown to be more complex when off-stoichiometric compouds are considered, due to the vicinity of metal-insulator transition. It is to be noted that the disappearance of sizable superconductivity occurs for 0.12<x<0.18, but the insulator features are only reached forx=1/3.
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