Abstract
A perovskitelike compound ${\mathrm{LaTiO}}_{3}$ shows insulating or barely metallic behavior depending on a slight (\ensuremath{\le}0.04) deviation of the Ti valence (+3) arising from nonstoichiometry of La and/or oxygen. In order to investigate electronic properties of the specimens in the very vicinity of the Mott insulator-metal phase boundary, we have measured the doping- and pressure-induced effects on the electrical and magnetic properties. The results have indicated a crossover behavior from localized to itinerant nature of the electronic state with increase of the doping level and one-electron bandwidth.
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