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arXiv · 1603.07184

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

Jaeho Shin·Jaewon Choi·Keiya Shirahama·Eunseong Kim
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Abstract

We investigate the origin of a resonant period drop of a torsional oscillator (TO) containing solid ${}^{4}$He 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. Although the temperature, ${}^{3}$He 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 ${}^{4}$He connected with low-angle grain boundaries by studying the shear modulus parallel to and perpendicular to the driving direction.

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Jaeho Shin, Jaewon Choi, Keiya Shirahama, Eunseong Kim. 2016-03-23. Simultaneous investigation of shear modulus and torsional resonance of solid 4He. https://doi.org/10.1103/physrevb.93.214512

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