Glass-Like Heat Conduction in High-Mobility Crystalline Semiconductors

Details Glass-Like Heat Conduction in High-Mobility Crystalline Semiconductors Glass-Like Heat Conduction in High-Mobility Crystalline Semiconductors

1998-12-23

arxiv.org/abs/cond-mat/9812387v1

Physics

Condensed Matter

Materials Science

4 pages, 3 postscript figures, to be published, Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.82.779

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 ($\sim 100 cm^2/Vs$). 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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