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Investigation of the Mechanism of the Enhanced Z 3D T in PbTe Based Superlattices

  • T. Koga (a1), T. C. Harman (a2), X. Sun (a3), S. B. Cronin (a3) and M. S. Dresselhaus (a3) (a4)...

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.

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