Archive: 2019 - Moldavian Journal of the Physical Sciences

27 Dec 2019

2019
V. 18
1-4
(p.36 - 45)

Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb

CZU: 539.21:537.8

Authors:

Nikolaeva, Albina; Konopko, Leonid; Popov, Ivan; Slobodenyuk, K.; Rastegaiev, Ghenadie; Istrate, Eugeniu

Summary:

Results of a study of the magnetothermoelectric properties and the Shubnikov–de Haas effect in single-crystal wires of various diameters and films based on Bi1–xSbx semimetal alloys have been described. According to the Shubnikov–de Haas oscillations, it has been calculated that the overlap of the L and T bands in the Bi–3at%Sb semimetal wires decreases more than twofold owing to an increase in the antimony concentration. Thermoelectric gap E, the dependence of the gap on wire diameter d, and the temperature dependence of power factor 2(T) as a function of diameter and magnetic field have been calculated. It has been found that a decrease in wire diameter d leads to a semimetal–semiconductor transition at d < 1.2 m, which is more than an order of magnitude higher than in pure Bi wires and 1.5 times higher than in wires of Bi–2at%Sb alloys. It has been shown that thermal gap E increases with decreasing wire diameter d in accordance with a law close to 1/d, which is consistent with theoretical calculations based on the occurrence of the quantum size effect in semimetals. A switching effect in the magnetothermopower has been found; the dependence of this effect on wire diameter d and temperature has been determined. It has been shown that, in a weak magnetic field, the magnetothermopower anisotropy in Bi–3at%Sb wires and films increases with decreasing temperature; this feature can be used in anisotropic thermoelectric energy converters.

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BibTeX

@article{ibn_98829,
author = {Nikolaeva, A. and Konopko, L.A. and Popov, I.A. and Slobodenyuk, K. and Rastegaiev, G. and Istrate, E.C.},
title = {<p>Magnetothermoelectric properties of single-crystal wires and films based on Bi&ndash;3at%Sb</p>},
journal = {Moldavian Journal of the Physical Sciences},
year = {2019},
volume = {18 (1-4)},
pages = {36-45},
month = {Dec},
abstract = {(EN) <p>Results of a study of the magnetothermoelectric properties and the Shubnikov&ndash;de Haas effect in single-crystal wires of various diameters and films based on Bi1&ndash;xSbx semimetal alloys have been described. According to the Shubnikov&ndash;de Haas oscillations, it has been calculated that the overlap of the L and T bands in the Bi&ndash;3at%Sb semimetal wires decreases more than twofold owing to an increase in the antimony concentration. Thermoelectric gap E, the dependence of the gap on wire diameter d, and the temperature dependence of power factor 2(T) as a function of diameter and magnetic field have been calculated. It has been found that a decrease in wire diameter d leads to a semimetal&ndash;semiconductor transition at d &lt; 1.2 m, which is more than an order of magnitude higher than in pure Bi wires and 1.5 times higher than in wires of Bi&ndash;2at%Sb alloys. It has been shown that thermal gap E increases with decreasing wire diameter d in accordance with a law close to 1/d, which is consistent with theoretical calculations based on the occurrence of the quantum size effect in semimetals. A switching effect in the magnetothermopower has been found; the dependence of this effect on wire diameter d and temperature has been determined. It has been shown that, in a weak magnetic field, the magnetothermopower anisotropy in Bi&ndash;3at%Sb wires and films increases with decreasing temperature; this feature can be used in anisotropic thermoelectric energy converters.</p>},
url = {https://ibn.idsi.md/vizualizare_articol/98829},
}

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<dc:description xml:lang='en'><p>Results of a study of the magnetothermoelectric properties and the Shubnikov&ndash;de Haas effect in single-crystal wires of various diameters and films based on Bi1&ndash;xSbx semimetal alloys have been described. According to the Shubnikov&ndash;de Haas oscillations, it has been calculated that the overlap of the L and T bands in the Bi&ndash;3at%Sb semimetal wires decreases more than twofold owing to an increase in the antimony concentration. Thermoelectric gap E, the dependence of the gap on wire diameter d, and the temperature dependence of power factor 2(T) as a function of diameter and magnetic field have been calculated. It has been found that a decrease in wire diameter d leads to a semimetal&ndash;semiconductor transition at d &lt; 1.2 m, which is more than an order of magnitude higher than in pure Bi wires and 1.5 times higher than in wires of Bi&ndash;2at%Sb alloys. It has been shown that thermal gap E increases with decreasing wire diameter d in accordance with a law close to 1/d, which is consistent with theoretical calculations based on the occurrence of the quantum size effect in semimetals. A switching effect in the magnetothermopower has been found; the dependence of this effect on wire diameter d and temperature has been determined. It has been shown that, in a weak magnetic field, the magnetothermopower anisotropy in Bi&ndash;3at%Sb wires and films increases with decreasing temperature; this feature can be used in anisotropic thermoelectric energy converters.</p></dc:description>
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“ ... ”

SM ISO690:2012

NIKOLAEVA, Albina; KONOPKO, Leonid; POPOV, Ivan; SLOBODENYUK, K.; RASTEGAEV, Ghennadii; ISTRATE, Eugeniu. Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb. In: Moldavian Journal of the Physical Sciences. 2019, nr. 1-4(18), pp. 36-45. ISSN 1810-648X.