The authors have developed a general theory by using the effective-medium approximation (EMA) to calculate the thermoelectric power coefficient S for polycrystalline metals. They apply the theory to the new high-T c superconductors La 2-x M x CuO 4 (M=Ba, Sr). The theory is in good agreement with experimental data for the doping concentration function S(x).
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Xia et al. (1987) studied this question.
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