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Thermoelectric Properties of Bi microwires at Low Temperatures

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dc.contributor.author KONOPKO, Leonid
dc.date.accessioned 2024-01-05T07:28:45Z
dc.date.available 2024-01-05T07:28:45Z
dc.date.issued 2009
dc.identifier.citation KONOPKO, Leonid. Thermoelectric Properties of Bi microwires at Low Temperatures. In: Microelectronics and Computer Science: proc. 6th International Conference, 1-3 Oct. 2009, Chişinău, Republica Moldova, vol. 1, 2009, pp. 43-46. ISBN 978-9975-45-045-4. ISBN 978-9975-45-122-2 (vol. 1). en_US
dc.identifier.isbn 978-9975-45-045-4
dc.identifier.isbn 978-9975-45-122-2
dc.identifier.uri http://repository.utm.md/handle/5014/25715
dc.description The thermopower of single crystalline Bi microwires with diameters ranging from 0.1 to 14 μm were measured in the temperature range 4 – 300 K. Cylindrical crystals with glass coating were prepared by the high frequency liquid phase casting in a glass capillary. The peaks are the dominant features of the temperature dependences of thermopower at temperatures below 12 K. This peak is a manifestation of the phonon drag effect. We observe that the phonon-drag thermopower depends on the wire diameter and increases with increasing diameter of the sample. We have studied the dependence of the phonon drag thermopower on transverse magnetic field and transverse electric field. Effect of transverse magnetic field (B=0.4 T) of various orientation to the phonon drag thermopower is negligible for Bi microwires d<0.6 μm but quickly arise for Bi microwires d>1.5 μm. This means that in fine Bi microwires at low temperatures mobility of electrons are much smaller than holes (due to strong surface scattering of electrons on surface roughnesses). Influence of transverse electric field to the phonon drag thermopower of Bi microwires is very small. A possible explanation of these experimental results is presented. en_US
dc.description.abstract The thermopower of single crystalline Bi microwires with diameters ranging from 0.1 to 14 μm were measured in the temperature range 4 – 300 K. Cylindrical crystals with glass coating were prepared by the high frequency liquid phase casting in a glass capillary. The peaks are the dominant features of the temperature dependences of thermopower at temperatures below 12 K. This peak is a manifestation of the phonon drag effect. We observe that the phonon-drag thermopower depends on the wire diameter and increases with increasing diameter of the sample. We have studied the dependence of the phonon drag thermopower on transverse magnetic field and transverse electric field. Effect of transverse magnetic field (B=0.4 T) of various orientation to the phonon drag thermopower is negligible for Bi microwires d<0.6 μm but quickly arise for Bi microwires d>1.5 μm. This means that in fine Bi microwires at low temperatures mobility of electrons are much smaller than holes (due to strong surface scattering of electrons on surface roughnesses). Influence of transverse electric field to the phonon drag thermopower of Bi microwires is very small. A possible explanation of these experimental results is presented. en_US
dc.language.iso en en_US
dc.publisher Technical University of Moldova en_US
dc.relation.ispartof Proceeding of the 6th International Conference on "Microelectronics and Computer Science", oct.1-3, 2009, Chişinău, Moldova
dc.rights Attribution-NonCommercial-NoDerivs 3.0 United States *
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/us/ *
dc.subject bismuth en_US
dc.subject magnetic fields en_US
dc.subject microwires en_US
dc.subject phonon drag effect en_US
dc.subject thermopower en_US
dc.title Thermoelectric Properties of Bi microwires at Low Temperatures en_US
dc.type Article en_US


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