Abstract
We report the temperature dependence of electrical resistivity and thermoelectric power of the manganese perovskites Bi1−xCaxMnO3 (0.7 ⩽ x ⩽ 0.95). The resistivity for x = 0.75 and 0.7 is well fitted with ρ ∝ exp(l/T)(1/4) below the charge-ordering temperatures (Tco). The temperature dependence of thermoelectric power for samples with x = 0.8, 0.75 and 0.7 shows the rapid decrease below Tco. In the lower temperatures than Tco, it goes through minimum and absolute thermoelectric power decreases and tends to change the sign. The activation energy was estimated as 57, 64, 148 meV for x = 0.8, 0.75, 0.7 from the linear fits in the form S − 1/T plots. The activation energy increases with decreasing the Ca content in the Bi1−xCaxMnO3 system.
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