The glassy response of solid He-4 to torsional oscillations

Abstract

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.

9 pages, 4 figures, presented at QFS2009

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Cited by in corpus (9)

• Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He
• ${}^4$He Crystal Quality and Rotational Response in a Transparent Torsional Oscillator
• A glass anomaly in the shear modulus of solid ${}^4$He
• Effects of ${}^3$He Impurity on Solid ${}^4$He Studied by Compound Torsional Oscillator
• The glassy response of double torsion oscillators in solid Helium-4
• Shear modulus in viscoelastic solid ${}^4$He
• A tentative replica theory of glassy Helium 4
• Defects and glassy dynamics in solid He-4: Perspectives and current status
• The role of glass dynamics in the anomaly of the dielectric function of solid helium