Institute of Physics, University of Tsukuba, Tennodai, Tsukuba 305-8571, Japan.
J Phys Condens Matter. 2011 Feb 2;23(4):045604. doi: 10.1088/0953-8984/23/4/045604. Epub 2011 Jan 12.
The electronic properties and the thermoelectric power factors in the metal-band-insulator crossover of the perovskite-type oxygen deficient system SrTiO(3 - δ/2) with 0.0046 ≤ δ < 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 × 10( - 3) W m( - 1) K( - 2) with the carrier concentration of 2 × 10(20) cm( - 3) at around the Fermi energy comparable to the Debye temperature.
通过对钙钛矿型缺氧系统 SrTiO(3 - δ/2)（0.0046 ≤ δ < 0.06）的 x 射线衍射、电阻率、热电功率、霍尔系数和磁化率的测量，研究了其在金属-绝缘带交叉中的电子特性和热电功率因子。金属输运基本上通过电子相关散射、声学声子和极性光学声子来解释，其中每个散射系数几乎与霍尔系数估算的有效载流子浓度的倒数呈线性关系。在费米能量附近与德拜温度相当的载流子浓度为 2×10(20)cm(-3)时，热电功率因子的上限为 2×10(-3)Wm(-1)K(-2)。
