Galvanomagnetic and Thermoelectric Properties
of p-Bi_2xSb_xTe_3ySe_y Solid Solutions
at Low Temperatures (<220 K)

L. N. Luk’yanova, V. A. Kutasov, V. V. Popov, and P. P. Konstantinov

Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021 Russia

e-mail: lidia.lukyanova@mail.ioffe.ru

Received November 18, 2003

Abstract—The galvanomagnetic and thermoelectric properties of p-Bi_2–xSb_xTe_3–ySe_y solid solutions (x 1.2,
y 0.09) are studied for various carrier concentrations. The degeneracy parameter _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 were used to calculate the effective scattering parameter
r_eff and the reduced Fermi level . 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/m₀ and mobility ₀ in
samples with various carrier concentrations were determined. © 2004 MAIK “Nauka/Interperiodica”.

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