Absence of Slow Sound Modes in Supersolid (4)He

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Torsional oscillator experiments on solid He-4 have been interpreted as showing mass decoupling similar to what one observes in a superfluid. Within the context of a two-component model for the supersolid one would expect the appearance of a second, slow acoustic mode. We have searched for this mode using an acoustic resonance technique. We have used porous membranes in bulk solid He-4 analogous to a second sound experiment in the superfluid. We also investigated solid helium in Vycor using piezoelectrically driven titanium diaphragms (analogous to a fourth sound experiment in the liquid). Our measurements have shown no indication of an additional sound mode in the kHz range.
Publisher
SPRINGER/PLENUM PUBLISHERS
Issue Date
2010-02
Language
English
Article Type
Article
Keywords

SOLID HE-4; SUPERFLUIDITY

Citation

JOURNAL OF LOW TEMPERATURE PHYSICS, v.158, no.3-4, pp.590 - 595

ISSN
0022-2291
DOI
10.1007/s10909-009-0044-3
URI
http://hdl.handle.net/10203/96577
Appears in Collection
PH-Journal Papers(저널논문)
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