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

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...

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Autores principales:	Nikolaeva, Albina, Konopko, Leonid, Popov, Ivan, Slobodenyuk, K., Rastegaiev, Ghenadie, Istrate, Eugeniu
Formato:	article
Lenguaje:	EN
Publicado:	D.Ghitu Institute of Electronic Engineering and Nanotechnologies 2019
Materias:	Physics QC1-999 Electronics TK7800-8360
Acceso en línea:	https://doaj.org/article/216f23a493e843cdbefb71e3bc74d2e6
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spelling	oai:doaj.org-article:216f23a493e843cdbefb71e3bc74d2e62021-11-21T11:55:45ZMagnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb539.21:537.82537-63651810-648Xhttps://doaj.org/article/216f23a493e843cdbefb71e3bc74d2e62019-12-01T00:00:00Zhttps://mjps.nanotech.md/archive/2019/article/98829https://doaj.org/toc/1810-648Xhttps://doaj.org/toc/2537-6365Results 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.Nikolaeva, AlbinaKonopko, LeonidPopov, IvanSlobodenyuk, K.Rastegaiev, GhenadieIstrate, EugeniuD.Ghitu Institute of Electronic Engineering and NanotechnologiesarticlePhysicsQC1-999ElectronicsTK7800-8360ENMoldavian Journal of the Physical Sciences, Vol 18, Iss 1-4, Pp 36-45 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	Physics QC1-999 Electronics TK7800-8360
spellingShingle	Physics QC1-999 Electronics TK7800-8360 Nikolaeva, Albina Konopko, Leonid Popov, Ivan Slobodenyuk, K. Rastegaiev, Ghenadie Istrate, Eugeniu Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb
description	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.
format	article
author	Nikolaeva, Albina Konopko, Leonid Popov, Ivan Slobodenyuk, K. Rastegaiev, Ghenadie Istrate, Eugeniu
author_facet	Nikolaeva, Albina Konopko, Leonid Popov, Ivan Slobodenyuk, K. Rastegaiev, Ghenadie Istrate, Eugeniu
author_sort	Nikolaeva, Albina
title	Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb
title_short	Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb
title_full	Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb
title_fullStr	Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb
title_full_unstemmed	Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb
title_sort	magnetothermoelectric properties of single-crystal wires and films based on bi–3at%sb
publisher	D.Ghitu Institute of Electronic Engineering and Nanotechnologies
publishDate	2019
url	https://doaj.org/article/216f23a493e843cdbefb71e3bc74d2e6
work_keys_str_mv	AT nikolaevaalbina magnetothermoelectricpropertiesofsinglecrystalwiresandfilmsbasedonbi3atsb AT konopkoleonid magnetothermoelectricpropertiesofsinglecrystalwiresandfilmsbasedonbi3atsb AT popovivan magnetothermoelectricpropertiesofsinglecrystalwiresandfilmsbasedonbi3atsb AT slobodenyukk magnetothermoelectricpropertiesofsinglecrystalwiresandfilmsbasedonbi3atsb AT rastegaievghenadie magnetothermoelectricpropertiesofsinglecrystalwiresandfilmsbasedonbi3atsb AT istrateeugeniu magnetothermoelectricpropertiesofsinglecrystalwiresandfilmsbasedonbi3atsb
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Magnetothermoelectric properties of single-crystal wires and films based on Bi–3at%Sb

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