Electronic and Thermodynamic Properties of Sn and SbI3 Doped Single Crystals p - Bi2Te3

27th International Conference on Low Temperature Physics

Tahar, M.Z.^1 ; Popov, D.I.^2 ; Nemov, S.A.^3

Department of Physics, State University of New York at Brockport, NY

14420, United States^1

ZAO NevInPat, per. Pirogova 7, St.-Petersburg

190000, Russia^2

State Polytechnical University, Politechnicheskaya ul.29, St.-Petersburg

195251, Russia^3

关键词: High amplitudes;    Impurity energy state;    Inhomogeneities;    One-electron state;    Spatial homogeneity;    Spatial in-homogeneity;    Temperature dependence;    Thermoelectrics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/5/052033/pdf
DOI  :  10.1088/1742-6596/568/5/052033

来源: IOP

【 摘 要 】

Bi2Te3- Sb2Te3solid solutions, the most commonly used thermoelectrics (∼300K), are characterized by inhomogeneities and defects of various types, and doping contributes to spatial inhomogeneity. These impurity energy states fall into the band gap with small high-field SdH oscillations. However, it is known that Sn impurity pins the Fermi level and tremendously improves the spatial homogeneity, leading to observation of high amplitude SdH oscillations in lower magnetic field. The iodine (I) impurity was chosen to shift the Fermi level and affect the filling factor of impurity states. Numerous experimental results on magnetoresistivity, specific heat and magnetic susceptibility indicate that the most probable model for one-electron states in Bi2Te3solid solutions doped with Sn is the presence of two impurity bands one filled and one empty- with the Fermi level pinned in-between. Earlier we reported on SdH oscillations at T 4.2K and in magnetic Field up to 10T. Here, we report on investigations of the magnetoresistivity (2