Transverse magnetoresistance peculiarities of thermoelectric Lu-doped Bi2Te3 compound due to strong electrical disorder
| Autor: | Elena Danshina, Oleg Ivanov, Maxim Yaprintsev |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
Electron mobility
Materials science Magnetoresistance Field (physics) Condensed matter physics business.industry Doping 02 engineering and technology General Chemistry Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Magnetic field Condensed Matter::Materials Science Thermal conductivity Semiconductor Geochemistry and Petrology Thermoelectric effect Condensed Matter::Strongly Correlated Electrons 0210 nano-technology business |
| Zdroj: | Journal of Rare Earths. 37:292-298 |
| ISSN: | 1002-0721 |
| DOI: | 10.1016/j.jre.2018.07.007 |
| Popis: | The n-type thermoelectric Bi1.9Lu0.1Te3 was prepared by microwave-solvothermal method and spark plasma sintering. The magnetic field and temperature dependences of transverse magnetoresistance measured within temperature 2–200 K interval allow finding the peculiarities characteristic for strongly disordered and inhomogeneous semiconductors. The first peculiarity is due to appearance of linear-in-magnetic field contribution to the total magnetoresistance reflected in a crossover from quadratic magnetoresistance at low magnetic fields to linear magnetoresistance at high magnetic fields. The linear magnetoresistance can result from the Hall resistance picked up from macroscopically distorted current paths due to local variations in stoichiometry of the compound studied. The second peculiarity is that both linear magnetoresistance magnitude and crossover field are functions of carrier mobility which is in agreement with the Parish and Littlewood model developed for disordered and inhomogeneous semiconductors. An increase in the mobility due to a decrease in temperature is accompanied by an increase in the magnetoresistance magnitude and a decrease in the crossover field. Finally, the third peculiarity is related to the remarkable deviation of the total magnetoresistance measured at various temperatures from the Kohler's rule. Presence of strong inhomogeneity and disorder in the Bi1.9Lu0.1Te3 structure concluded from the magnetoresistance peculiarities can be responsible for the remarkable reduction in the total thermal conductivity of this compound. |
| Databáze: | OpenAIRE |
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