Galvanomagnetic and thermoelectric properties of p-Bi2?xSbxTe3?ySey solid solutions at low temperatures (<220 K)

The galvanomagnetic and thermoelectric properties of p-Bi_2−x Sb_xTe_3−y Se_y solid solutions (x≤1.2, y≤0.09) are studied for various carrier concentrations. The degeneracy parameter β_d governing the scattering processes in solid solutions was calculated in terms of the many-valley energy spectrum model. The data on the degeneracy parameter and the Seebeck coefficient α were used to calculate the effective scattering parameter r _eff and the reduced Fermi level η. The parameter r _eff was found to depend on the carrier concentration in the materials studied. The temperature dependences of the effective density-of-states mass m/m ₀ and mobility μ₀ in samples with various carrier concentrations were determined. __________ Translated from Fizika Tverdogo Tela, Vol. 46, No. 8, 2004, pp. 13662–1371. Original Russian Text Copyright ? 2004 by Luk’yanova, Kutasov, Popov, Konstantinov.