Viscoelastic Behavior of Solid $^4$He

Details Viscoelastic Behavior of Solid $^4$He Viscoelastic Behavior of Solid $^4$He

2008-10-14

arxiv.org/abs/0810.2525v1

Phys. Rev. B 79, 100504(R) (2009)

Physics

Condensed Matter

Other Condensed Matter

4 pages, 3 figures

Scientific paper

10.1103/PhysRevB.79.100504

Over the last five years several experimental groups have reported anomalies in the temperature dependence of the period and amplitude of a torsional oscillator containing solid $^4$He. We model these experiments by assuming that $^4$He is a viscoelastic solid--a solid with frequency dependent internal friction. We find that while our model can provide a quantitative account of the dissipation observed in the torsional oscillator experiments, it only accounts for about 10% of the observed period shift, leaving open the possibility that the remaining period shift is due to the onset of superfluidity in the sample.

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