Abstract
The carrier-doping (or band-filling) dependence of electronic states has been investigated in the perovskitelike titanate compounds, ${\mathrm{La}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{TiO}}_{3}$ and ${\mathrm{Y}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ca}}_{\mathit{x}}$${\mathrm{TiO}}_{3}$, by measurements of the specific heat. The linear temperature coefficient of the electronic specific heat, \ensuremath{\gamma}, is enhanced significantly near the metal-insulator phase-transition boundary, indicating a divergent increase of the effective electron mass due to the strong electronic correlation on approaching the metal-insulator transition boundary. The result is argued in comparison with that of the high-${\mathit{T}}_{\mathit{c}}$ cuprates.
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