Interplay of Rotational, Relaxational, and Shear Dynamics in Solid 4He

Abstract

Using a high-sensitivity torsional oscillator technique, we mapped the rotational and relaxational dynamics of solid helium-4 throughout the parameter range of the proposed supersolidity. We found evidence that the same microscopic excitations controlling the torsional oscillator motions are generated independently by thermal and mechanical stimulation. Moreover, a measure for the relaxation times of these excitations diverges smoothly without any indication for a critical temperature or critical velocity of a supersolid transition. Finally, we demonstrated that the combined temperature-velocity dependence of the TO response is indistinguishable from the combined temperature-strain dependence of the solid's shear modulus. This implies that the rotational responses of solid helium-4 attributed to supersolidity are associated with generation of the same microscopic excitations as those produced by direct shear strain.

27 pages with 4 main figures and 7 supplemental figures

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Cited by in corpus (14)

• Supersolids: what and where are they ?
• Bose-Einstein Condensation in liquid ${}^4$He near the liquid-solid transition line
• Mass flow through solid 4He induced by the fountain effect
• The Anomalous Behavior of Solid ${}^4$He in Porous Vycor Glass
• Theory of Supersolidity
• The low temperature elastic anomalies in solid helium
• NMR Investigation of the Low Temperature Dynamics of solid 4He doped with 3He impurities
• Plastic response by dislocation glide in solid helium under dc strain rate loading
• Excitations of amorphous solid helium
• Defects and glassy dynamics in solid He-4: Perspectives and current status
• Superfluid-like TO Responses in Rotating Solid Helium
• Saga of Superfluid Solids
• Shear Modulus of an Elastic Solid under External Pressure as a function of Temperature: The case of Helium
• The role of glass dynamics in the anomaly of the dielectric function of solid helium