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- W2076502912 abstract "Whether the torsional oscillator experiments on helium-4 reveal supersolid behaviour remains debatable, not least because the history of the sample matters. Many inconsistencies across different experiments may be explained by the presence of two hidden phases. Liquid helium becomes a superfluid and flows with zero viscosity at low temperatures. Superfluidity is manifested by a failure to rotate, as its mass is decoupled from the rotation of the containing cell. Supersolid helium should show similar behaviour; apparent rotational inertia decreases when the solid helium is set into torsional oscillation below 200 mK (refs 1, 2). However, a number of later experiments3,4,5,6,7 revealed characteristics unexpected within a conventional superfluid framework. Recent observations include hysteresis in the resonant period8,9 and relaxation dynamics10. To account for the inconsistencies, there are various proposals that include superfluid grain boundaries11, glassy behaviour12,13, viscoelasticity14, a vortex fluid15 and a superglass16. Here we systematically investigate the hysteresis and relaxation processes with a set of temperature and velocity sweeps. We unveil two hidden states associated with pinning of low-temperature excitations and construct a new phase diagram." @default.
- W2076502912 created "2016-06-24" @default.
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- W2076502912 date "2010-04-04" @default.
- W2076502912 modified "2023-09-26" @default.
- W2076502912 title "Observation of hidden phases in supersolid 4He" @default.
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- W2076502912 doi "https://doi.org/10.1038/nphys1630" @default.
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