Frequency Dependence and Dissipation in the Dynamics of Solid Helium
Other Condensed Matter
2010-04-15 v2
Abstract
Torsional oscillator experiments on solid 4He show frequency changes which suggest mass decoupling, but the onset is broad and is accompanied by a dissipation peak. We have measured the elastic shear modulus over a broad frequency range, from 0.5 Hz to 8 kHz, and observe similar behavior - stiffening and a dissipation peak. These features are associated with a dynamical crossover in a thermally activated relaxation process in a disordered system rather than a true phase transition. If there is a transition in the DC response, e.g. to a supersolid state, it must occur below 55 mK.
Cite
@article{arxiv.1002.2608,
title = {Frequency Dependence and Dissipation in the Dynamics of Solid Helium},
author = {Oleksandr Syshchenko James Day John Beamish},
journal= {arXiv preprint arXiv:1002.2608},
year = {2010}
}