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- W2035653268 abstract "The structural and electronic properties in the metal-band-insulator crossover of the perovskite-type oxygen deficient system SrTiO(3-δ/2) and the Sr-rare-earth element substituted systems Sr(1-x)Ce(x)TiO(3-δ(n)/2) and Sr(1-x)La(x)TiO(3-δ(n)/2), δ(n) being the nominal value, are explored in order to clarify the transport mechanisms and to determine the thermoelectric power factors, through measurements of the x-ray diffraction, electrical resistivity, thermoelectric power, Hall coefficient and magnetic susceptibility. The metallic transport for SrTiO(3-δ/2) with δ≤0.2 and that for Sr(1-x)Ce(x)TiO(3-δ(n)/2) and Sr(1-x)La(x)TiO(3-δ(n)/2) with x≈0.02 and δ(n) = 0 are explained successfully on the basis of scattering by electron correlations, acoustic phonons with the Debye temperature 4 × 10(2) K and polar optical phonons with the Einstein temperature of the order of 10(3) K. The composition dependences of the carrier concentrations of Sr(1-x)Ce(x)TiO(3-δ(n)/2) and Sr(1-x)La(x)TiO(3-δ(n)/2) with δ(n) = 0 are explained in terms of a one-band model, while those of SrTiO(3-δ/2) with δ>0 are explained in terms of a two-band model, as suggested in part previously. For all of the systems, the effective mass ratio of the transport is about 3 and a thermoelectric power factor is found to have a power of -2/3 in the carrier concentration. The factor over 10(-3) W m(-1) K(-2) at 300 K is obtained for SrTiO(2.97) with the smallest δ in this work." @default.
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- W2035653268 date "2009-10-08" @default.
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- W2035653268 title "Correlation and phonon effects for the electronic transport and thermoelectric power factors in the metal–band-insulator crossover of perovskite-type titanates" @default.
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- W2035653268 doi "https://doi.org/10.1088/0953-8984/21/43/435603" @default.
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