Journal Article10.1103/PHYSREVLETT.16.789
Second Sound in Solid Helium
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TL;DR: In this paper, an experiment on temperature pulse propagation in a bcc crystal grown at 959 atm shows the existence of second sound in the solid below about 058\ifmmode^\circ\else\text degree\fi{}
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Abstract: An experiment on temperature pulse propagation in a bcc crystal of $^{3}\mathrm{He}$ grown at 959 atm shows the existence of second sound in the solid below about 058\ifmmode^\circ\else\textdegree\fi{}K In the temperature range $042\ifmmode^\circ\else\textdegree\fi{}\mathrm{K}lTl058\ifmmode^\circ\else\textdegree\fi{}\mathrm{K}$, reflections of the received pulses were observed In the range $058\ifmmode^\circ\else\textdegree\fi{}\mathrm{K}lTl12\ifmmode^\circ\else\textdegree\fi{}\mathrm{K}$, the temperature pulses were observed to propagate diffusively
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References
Second Sound in Solids
TL;DR: In this article, a critical frequency for thermal fluctuations is calculated above which heat transport proceeds by wave propagation rather than by diffusion, which is the analog of second sound in helium II.
567
Thermal Conductivity of Perfect Dielectric Crystals in the Absence of Umklapp Processes
J A Sussmann,A Thellung +1 more
- 01 Jun 1963
TL;DR: In this article, the thermal conductivity of a perfect but finite crystal is investigated at low temperatures when Umklapp processes may be neglected and the sample is taken to be large compared with the mean free path due to momentum conserving phonon-phonon processes.
106
The velocity of second sound in liquid helium near the absolute zero
J.C. Ward,J. Wilks +1 more
TL;DR: The velocity of second sound in liquid helium near the absolute zero was investigated in this paper, where it was shown that it is a function of the velocity of the second sound of liquid helium.
98