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

Jaeho Shin, Jaewon Choi, Keiya Shirahama, Eunseong Kim

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We investigate the origin of a resonant period drop of a torsional oscillator (TO) containing solid He4 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, He3 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 He4 connected with low-angle grain boundaries by studying the shear modulus parallel to and perpendicular to the driving direction.

Original languageEnglish
Article number214512
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume93
Issue number21
DOIs
Publication statusPublished - 2016 Jun 20

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

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