Thermal conductivity in PbTe from first principles

A. H. Romero, E. K.U. Gross, M. J. Verstraete, Olle Hellman

Research output: Contribution to journalArticlepeer-review

98 Scopus citations

Abstract

We investigate the harmonic and anharmonic contributions to the phonon spectrum of lead telluride and perform a complete characterization of how thermal properties of PbTe evolve as temperature increases. We analyze the thermal resistivity's variation with temperature and clarify misconceptions about existing experimental literature. The resistivity initially increases sublinearly because of phase space effects and ultra strong anharmonic renormalizations of specific bands. This effect is the strongest factor in the favorable thermoelectric properties of PbTe, and it explains its limitations at higher T. This quantitative prediction opens the prospect of phonon phase space engineering to tailor the lifetimes of crucial heat carrying phonons by considering different structure or nanostructure geometries. We analyze the available scattering volume between TO and LA phonons as a function of temperature and correlate its changes to features in the thermal conductivity.

Original languageAmerican English
Article number214310
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume91
Issue number21
DOIs
StatePublished - 29 Jun 2015
Externally publishedYes

Bibliographical note

Publisher Copyright:
© 2015 American Physical Society.

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