2016/03/23 by Jaeho Shin, Jaewon Choi, Keiya Shirahama +1
Earth and Planetary Sciences · Mathematics · Physics and Astronomy · #Amplitude #Anisotropy #Atomic and Subatomic Physics Research #Elastic modulus #High-pressure geophysics and materials #Materials science #Mathematical analysis #Mathematics #Optics #Physics #Quantum, superfluid, helium dynamics #Shear modulus #Thermodynamics #cond-mat.other
paper · pdf · doi:10.1103/physrevb.93.214512
published as Phys. Rev. B 93, 214512 (2016)
arxiv created 2016/03/23 · openalex publication_date 2016/06/20 · openalex created_date 2016/06/24 · arxiv updated 2016/06/29 · openalex updated_date 2026/08/05
We investigate the origin of a resonant period drop of a torsional oscillator (TO) containing solid 4He 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, 3He 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 4He connected with low-angle grain boundaries by studying the shear modulus parallel to and perpendicular to the driving direction.