Non-linear Elastic Response in Solid Helium: critical velocity or strain

Abstract

Torsional oscillator experiments show evidence of mass decoupling in solid 4He. This decoupling is amplitude dependent, suggesting a critical velocity for supersolidity. We observe similar behavior in the elastic shear modulus. By measuring the shear modulus over a wide frequency range, we can distinguish between an amplitude dependence which depends on velocity and one which depends on some other parameter like displacement. In contrast to the torsional oscillator behavior, the modulus depends on the magnitude of stress, not velocity. We interpret our results in terms of the motion of dislocations which are weakly pinned by 3He impurities but which break away when large stresses are applied.

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Cited by in corpus (20)

• Defect-induced supersolidity with soft-core bosons
• Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He
• Critical dislocation speed in helium-4 crystals
• Mass flow through solid 4He induced by the fountain effect
• Growth of solid hcp \^4He off the melting curve
• The elastic constants of solid 4He under pressure: a diffusion Monte Carlo study
• Holographic Supersolids
• Multiple Mode Torsional Oscillator Studies and Evidence for Supersolidity in Bulk 4He
• Observation of metastable hcp solid helium
• The low temperature elastic anomalies in solid helium
• Frequency-dependent Study of Solid Helium-4 Contained in a Rigid Double-torus Torsional Oscillator
• Plasticity induced superclimb in solid Helium-4: Direct and inverse effects
• Effect of Rotation on Elastic Moduli of Solid ${}^4$He
• Superfluid-like TO Responses in Rotating Solid Helium
• Simultaneous investigation of shear modulus and torsional resonance of solid 4He
• Dislocation Mobility and Anomalous Shear Modulus Effect in ${}^4$He Crystals
• Anomalously Small Excitation Gaps as a Precursor of Dislocation Core Superfluidity in Solid Helium-4
• Superfluid Field response to Edge dislocation motion
• Saga of Superfluid Solids
• Shear Modulus of an Elastic Solid under External Pressure as a function of Temperature: The case of Helium