Journal
PHYSICAL REVIEW B
Volume 93, Issue 21, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.93.214512
Keywords
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Funding
- National Research Foundation of Korea - Korean government Ministry of Science, ICT and Future Planning (MSIP) [2007-0054-848]
- Japan Society for the Promotion of Science [21224010]
- Grants-in-Aid for Scientific Research [21224010, 26247062] Funding Source: KAKEN
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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.
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