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Electric and Thermoelectric Properties of Quantum Wires Based on Bismuth Semimetal and its Alloys.

Published online by Cambridge University Press:  01 February 2011

A.A. Nikolaeva
Affiliation:
International Laboratory of High Magnetic Fields and Low Temperatures, Wroclav, Poland.
P.P. Bodiul
Affiliation:
Institute of Applied Physics, Kishinev, Moldova
D.V. Gitsu
Affiliation:
Institute of Applied Physics, Kishinev, Moldova
G. Para
Affiliation:
Institute of Applied Physics, Kishinev, Moldova
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Abstract

The resistance R(T), the magnetoresistance R(H) and the Seebeck coefficient S(T) of thin mono-crystalline glass-coated wires of pure and doped by acceptor impurities (Sn) bismuth are studied. The measurements are carried out in the temperature range 4.2 - 300 K, and the magnetic fields up to 14 T. A significant dependence of the resistance R(T) and thermoemf S(T) on doping, sample diameter and surface state is revealed. By recrystallization, annealing and etching the samples a change in the surface scattering character of the charge carriers was achieved. The influence of the strong (up to 3–4%) elastic stretch on the band structure and kinetic coefficients of thin wires was studied. The thermoelectric figure of merit in doped bismuth wires is estimated, and possible ways of its increase in the temperature range 77 - 300 K are regarded.

Type
Research Article
Copyright
Copyright © Materials Research Society 2000

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References

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