Abstract
Sr 1− x La x TiO 3 (0 ≦ x ≦ 0.10) single crystals were grown by a floating zone method. We found that electrical resistivity decreased with increasing La content and was 10 −3–10 −4Ω cm at room temperature. The resistivity decreased with decreasing temperature but not linearly. The negative sign of the Hall coefficient indicated charge carriers to be electrons for all compositions. The linear relation between the reciprocal Hall coefficient and the electrical conductivity for the La-doped samples implied that the carrier mobility was constant and the conductivity depended only on the carrier concentration at room temperature. The resistivity of oxygen-deficient-type SrTiO 2.98 was 1 to 2 orders of magnitude larger than that of Sr 1− x La x TiO 3 because of both low carrier concentration and low carrier mobility.
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