Time-Dependent Specific Heat of Crystals and Glasses at Low Temperatures

  • N. Sampat
  • M. Meissner


At low temperatures heat travels in solids predominantly by phonons. When a heat pulse is applied at the surface of a bulk sample, a hot phonon flux distribution propagates through the sample with the group velocity of sound. Depending on the static and dynamic properties of the solid, the thermal phonon equilibrium system interacts with the traveling phonon distribution. Below 1K, in a perfect dielectric crystal there is pure ballistic transport with no intrinsic scattering. In a glassy system, however, strong scattering processes exist due to anharmonic interactions and diffusive heat transport is observed.


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Copyright information

© Plenum Press, New York 1994

Authors and Affiliations

  • N. Sampat
    • 1
  • M. Meissner
    • 1
  1. 1.Hahn-Meitner-Institut BerlinBerlinGermany

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