Journal
SCIENCE
Volume 324, Issue 5927, Pages 632-636Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1169512
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Funding
- NSF [DM-0434801, DMR-0806629]
- Cornell University
- Natural Sciences and Engineering Research Council of Canada
- Japan Society for the Promotion of Science
- U.S. Department of Energy
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0806629] Funding Source: National Science Foundation
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Although solid helium-4 (He-4) may be a supersolid, it also exhibits many phenomena unexpected in that context. We studied relaxation dynamics in the resonance frequency f(T) and dissipation D(T) of a torsional oscillator containing solid He-4. With the appearance of the supersolid state, the relaxation times within f(T) and D(T) began to increase rapidly together. More importantly, the relaxation processes in both D(T) and a component of f(T) exhibited a complex synchronized ultraslow evolution toward equilibrium. Analysis using a generalized rotational susceptibility revealed that, while exhibiting these apparently glassy dynamics, the phenomena were quantitatively inconsistent with a simple excitation freeze-out transition because the variation in f was far too large. One possibility is that amorphous solid He-4 represents a new form of supersolid in which dynamical excitations within the solid control the superfluid phase stiffness.
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