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Frequency Dependence of the Supersolid Signature in Polycrystalline 4He

We report studies, using a two mode torsional oscillator, of the putative supersolid signature in polycrystalline 4He. Measurements at two frequencies enable us to eliminate the viscoelastic contribution to the signature, and other instrumental effects arising from the temperature dependent shear modulus of the sample. The complex response function of the sample, encoded via its effective moment of inertia, shows an unexpected and unexplained frequency dependence. This cannot be accounted for by glassy dynamics within the sample. The results do not rule out the possibility of supersolidity in bulk solid 4He. ?

preprint2014arXivOpen access
George NicholsMalcolm PooleJan NyekiJohn SaundersBrian Cowan
cond-mat.other
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Open access5 authors1 topic
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George NicholsMalcolm PooleJan NyekiJohn SaundersBrian Cowan

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