Journal
PHYSICAL REVIEW LETTERS
Volume 97, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.97.165301
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We have confirmed the existence, as first reported by Kim and Chan, of a supersolid state in solid He-4 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 the nonclassical rotational inertia signal is not a universal property of solid He-4 but can be eliminated through an annealing of the solid helium sample. This result has important implications for our understanding of the supersolid state.
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