Glass-Like Heat Conduction in High-Mobility Crystalline Semiconductors
J. L. Cohn, G. S. Nolas, V. Fessatidis, T. H. Metcalf, G. A. Slack
Abstract
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 ( 100 cm2/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.
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