期刊
JOURNAL OF LOW TEMPERATURE PHYSICS
卷 158, 期 3-4, 页码 590-595出版社
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-009-0044-3
关键词
Solid helium; Supersolid
资金
- NSF [DMR0804725]
- Creative Research Initiatives (Center for Supersolid and Quantum Matter Research) of MEST/KOSEF
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.
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