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Experimental determination of phonon thermal conductivity and Lorenz ratio of single-crystal bismuth telluride

Published online by Cambridge University Press:  25 October 2017

Mengliang Yao ,
Cyril Opeil ,
Stephen Wilson  and
Mona Zebarjadi
Mengliang Yao
Affiliation:
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
Cyril Opeil*
Affiliation:
Department of Physics, Boston College, Chestnut Hill, Massachusetts 02467, USA
Stephen Wilson
Affiliation:
Materials Department, University of California, Santa Barbara, California 93106, USA
Mona Zebarjadi
Affiliation:
Department of Electrical and Computer Engineering and Department of Materials Science and Engineering, University of Virginia, Charlottesville, Virginia 22904, USA
*
Address all correspondence to Cyril Opeil at opeil@bc.edu
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Abstract

We use a magnetothermal resistance method to measure the lattice thermal conductivity of single-crystal Bi2Te3 from 5 to 60 K. Lattice thermal conductivity is calculated by extrapolating the thermal conductivity versus electrical conductivity curve to a zero electrical conductivity value. Our results show that the measured phonon thermal conductivity follows the ${\rm e}^{{\it\Delta} _{{\rm min}}/T}$ temperature dependence and the Lorenz ratio corresponds to the modified Sommerfeld value in the intermediate temperature range. Our low-temperature experimental data and analysis on Bi2Te3 are a complement to previous measurements of Goldsmid (Ref. 17) and theoretical calculations by Hellman et al. (Ref. 18) at higher temperature 100–300 K.

Type
Research Letters
Information
MRS Communications , Volume 7 , Issue 4 , December 2017 , pp. 922 - 927
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Copyright
Copyright © Materials Research Society 2017 

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