Glasslike heat conduction in high-mobility crystalline semiconductors

J. L. Cohn, G. S. Nolas, V. Fessatidis, T. H. Metcalf, G. A. Slack

Research output: Contribution to journalArticlepeer-review

589 Scopus citations


The thermal conductivity of polycrystalline semiconductors with type-I clathrate hydrate crystal structure is reported. Ge clathrates (doped with Sr and/or Eu) exhibit lattice thermal conductivities typical of amorphous materials. Remarkably, this behavior occurs in spite of the well-defined crystalline structure and relatively high electron mobility (˜100cm2/Vs). The dynamics of dopant ions and their interaction with the polyhedral cages of the structure are a likely source of the strong phonon scattering.

Original languageEnglish (US)
Pages (from-to)779-782
Number of pages4
JournalPhysical Review Letters
Issue number4
StatePublished - 1999

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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