The glassy response of solid He-4 to torsional oscillations

Details The glassy response of solid He-4 to torsional oscillations The glassy response of solid He-4 to torsional oscillations

2009-07-28

arxiv.org/abs/0907.4965v1

Journal of Low Temperature Physics 158, Numbers 3-4 (2010) 550 (10 pages)

Physics

Condensed Matter

Materials Science

9 pages, 4 figures, presented at QFS2009

Scientific paper

10.1007/s10909-009-9958-z

We calculated the glassy response of solid He-4 to torsional oscillations assuming a phenomenological glass model. Making only a few assumptions about the distribution of glassy relaxation times in a small subsystem of otherwise rigid solid He-4, we can account for the magnitude of the observed period shift and concomitant dissipation peak in several torsion oscillator experiments. The implications of the glass model for solid He-4 are threefold: (1) The dynamics of solid He-4 is governed by glassy relaxation processes. (2) The distribution of relaxation times varies significantly between different torsion oscillator experiments. (3) The mechanical response of a torsion oscillator does not require a supersolid component to account for the observed anomaly at low temperatures, though we cannot rule out its existence.

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