I.K. Pour, D.J. Krajnovich, et al.
SPIE Optical Materials for High Average Power Lasers 1992
Using a molecular-dynamics technique simulating a canonical ensemble with nearly conserved energy, we studied the occurrence and some properties of second sound in terms of the calculated spectral densities. We considered two models: model I exhibiting a ferrodistortive phase, where displacement and energy fluctuations are coupled and third-order anharmonicity is dominant at low temperatures, and model II, where there is no ordered phase, and quartic anharmonicity is present only. Both models exhibit an optical-phonon branch only. Our molecular-dynamics technique makes it possible to study second sound and its damping in terms of a resonance in the appropriate spectral densities. The results confirm the existence of a temperature window, where well-defined second sound occurs. They also suggest that second sound might be a rather usual low-temperature phenomenon, provided the crystal is sufficiently clean. © 1978 The American Physical Society.
I.K. Pour, D.J. Krajnovich, et al.
SPIE Optical Materials for High Average Power Lasers 1992
J. Tersoff
Applied Surface Science
Lawrence Suchow, Norman R. Stemple
JES
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Physics of Fluids