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Observation of Classical Rotational Inertia and Nonclassical Supersolid Signals in Solid 4He below 250 mK

Ann Sophie C. Rittner·John D. Reppy
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Abstract

We have confirmed the existence, as first reported by Kim and Chan, of a supersolid state in solid 4He at temperatures below 250 mK. We have employed a torsional oscillator cell with a square cross section to insure a locking of the solid to the oscillating cell. We find that NCRI signal is not a universal property of solid 4He, but can be eliminated through an annealing of the solid helium sample. This result has important implications for the nature of the supersolid state.

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Ann Sophie C. Rittner, John D. Reppy. 2007-10-10. Observation of Classical Rotational Inertia and Nonclassical Supersolid Signals in Solid 4He below 250 mK. https://arxiv.org/abs/cond-mat/0604528

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