The upper limit of thermoelectric power factors in the metal-band-insulator crossover of the perovskite-type oxygen deficient system SrTiO3-(delta/2)

作者：Onoda Masashige^*; Tsukahara Shuichi

来源：Journal of Physics: Condensed Matter , 2011, 23(4): 045604.

DOI：10.1088/0953-8984/23/4/045604

The electronic properties and the thermoelectric power factors in the metal-band-insulator crossover of the perovskite-type oxygen deficient system SrTiO3-delta/2 with 0.0046 <= delta < 0.06 are explored through measurements of x-ray diffraction, electrical resistivity, thermoelectric power, Hall coefficient and magnetic susceptibility. The metallic transport is confirmed to be basically explained through scattering by electron correlations, acoustic phonons and polar optical phonons, where each scattering coefficient is almost linear in the inverse of the effective carrier concentration estimated from the Hall coefficient. The upper limit of the thermoelectric power factor is 2 x 10(-3) Wm(-1) K-2 with the carrier concentration of 2 x 10(20) cm(-3) at around the Fermi energy comparable to the Debye temperature.

• 出版日期2011-2-2