Simultaneous investigation of shear modulus and torsional resonance of solid He-4

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We investigate the origin of a resonant period drop of a torsional oscillator (TO) containing solid He-4 by inspecting its relation to a change in elastic modulus. To understand this relationship directly, we measure both phenomena simultaneously using a TO with a pair of concentric piezoelectric transducers inserted in its annulus. We confirm experimentally that both anomalies are directly related. Although the temperature, He-3 concentration, and frequency dependence are essentially the same, a marked discrepancy in the drive amplitude dependence is observed. We find that this discrepancy originates from the anisotropic response of polycrystalline solid He-4 connected with low-angle grain boundaries by studying the shear modulus parallel to and perpendicular to the driving direction
Publisher
AMER PHYSICAL SOC
Issue Date
2016-06
Language
English
Article Type
Article
Keywords

HCP HE-4; HELIUM; SUPERSOLIDITY; DISLOCATIONS

Citation

PHYSICAL REVIEW B, v.93, no.21, pp.214512

ISSN
2469-9950
DOI
10.1103/PhysRevB.93.214512
URI
http://hdl.handle.net/10203/212124
Appears in Collection
PH-Journal Papers(저널논문)
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