Abstract
Abstract The structural, magnetic and transport properties in the strontium rich part of Bi 1− x Sr x MnO 3 solid solution ( x ∈〈0.5;1〉) were examined by X-ray powder diffraction, DC susceptibility, thermopower, resisitivity and thermal conductivity measurements. All material characteristics are significantly changed at the temperature of charge ordering, T CO , which gradually decreases from ∼550 K for x =0.5 to almost 0 K at x =0.9. Above T CO a temperature independent thermopower, whose absolute value increases with x , indicates polaronic transport. Below T CO an activated transport mechanism of localized charge carriers is observed. The Weiss temperature decreases with x and becomes negative for x =0.8 suggesting antiferromagnetic interactions at high temperatures. The evolution of the above-mentioned effects is accompanied by a progressive decrease of orthorhombic distortion at room temperature.
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