Low frequency acoustics in solid $^4$He at low temperature
Other Condensed Matter
2015-05-13 v1 Superconductivity
Abstract
The elastic properties of hcp He samples have been investigated using low frequency (20 Hz to 20 kHz) high sensitivity sound transducers. In agreement with the findings of other workers, most samples studied grew very significantly stiffer at low temperature; Poisson's ratio was observed to increase from 0.28 below 20 mK to at 0.7 K. The span of the variation of varies from sample to sample according to their thermal and mechanical history. Crystals carefully grown at the melting curve show a different behavior, the change in taking place at lower and being more abrupt.
Cite
@article{arxiv.0908.1480,
title = {Low frequency acoustics in solid $^4$He at low temperature},
author = {Yu. Mukharsky and A. Penzev and E. Varoquaux},
journal= {arXiv preprint arXiv:0908.1480},
year = {2015}
}