Anna Eyal, Ethan Livne, Emil Polturak
Disordered single crystals of solid $^4$He contained inside a torsional oscillator behave as if part of the solid is decoupled from the oscillator. This effect persists up to temperatures as high as 1.9K. Our observations closely resemble the low temperature effects currently under debate regarding their interpretation in terms of supersolidity. Here, we report a systematic study of the temperature and stress dependence of the internal friction associated with this disordered solid. Our data support the idea that internal friction results from climb of dislocations.
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http://arxiv.org/abs/1206.0938
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