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Investigation of the Mechanism of the Enhanced Z3DT in PbTe Based Superlattices

Published online by Cambridge University Press:  10 February 2011

T. Koga ,
T. C. Harman ,
X. Sun ,
S. B. Cronin  and
M. S. Dresselhaus
T. Koga
Affiliation:
Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138
T. C. Harman
Affiliation:
Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, MA 02420
X. Sun
Affiliation:
Department of PhysicsCambridge, MA 02139
S. B. Cronin
Affiliation:
Department of PhysicsCambridge, MA 02139
M. S. Dresselhaus
Affiliation:
Department of PhysicsCambridge, MA 02139 Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Various possible mechanisms for the recently discovered enhanced Seebeck coefficient S in PbTe/Te superlattices relative to the corresponding PbTe bulk are investigated. Among the various mechanisms which can account for the enhanced S, the energy dependent τ model (τ ∼ ɛr) seems the most plausible. Here the effective scattering parameter r is preferably increased due to the extra scattering by the periodic Te layers introduced in the superlattice. Other transport properties including the longitudinal magnetoresistance are also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 545: Symposium Z – Thermoelectric Materials 1998 - The Next Generation… , 1998 , 479
Copyright
Copyright © Materials Research Society 1999

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