Journal
SCIENCE
Volume 330, Issue 6010, Pages 1512-1515Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1196409
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Funding
- National Research Foundation of Korea through Creative Research Initiatives
- Japan Society for the Promotion of Science
- National Research Foundation of Korea [2007-0054848] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Supersolidity, the appearance of zero-viscosity flow in solids, was first indicated in helium-4 torsional oscillator (TO) experiments. In this apparatus, the irrotationality of the superfluid component causes it to decouple from the underlying normal solid, leading to a reduction in the resonant period of the TO. However, the resonant period may be altered for reasons other than supersolidity, such as the temperature dependence of the elastic modulus of solid helium. Superimposing rotation onto oscillatory measurements may distinguish between supersolidity and classical effects. We performed such simultaneous measurements of the TO and the shear modulus, and observed substantial change in the resonant period with rotational speed where the modulus remained unchanged. This contrasting behavior suggests that the decrease in the TO period is a result of supersolidity.
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