Journal
JOURNAL OF LOW TEMPERATURE PHYSICS
Volume 175, Issue 1-2, Pages 147-153Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10909-013-0922-6
Keywords
Solid He-4; Viscoelastic properties; Plasticity
Categories
Funding
- Leverhulme Trust
- UK EPSRC
- European FP7 Programme MICROKELVIN Project [228464]
- Engineering and Physical Sciences Research Council [EP/L000016/1, EP/D072107/1, EP/H04762X/1, EP/I028285/1, 1064293] Funding Source: researchfish
- EPSRC [EP/L000016/1, EP/I028285/1, EP/D072107/1, EP/H04762X/1] Funding Source: UKRI
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We present measurements of a thin wire moving through solid He-4. Measurements were made over a wide temperature range at pressures close to the melting curve. We describe the new experimental technique and present preliminary measurements at relatively high driving forces (stresses) and velocities (strain rates). The wire moves by plastic deformation of the surrounding solid facilitated by quantum tunneling of vacancies and the motion of defects. In the bcc phase we observe very pronounced viscoelastic effects with relaxation times spanning several orders of magnitude. In the hcp phase we observe stochastic step-like motion of the wire. During the step, the wire can move at extremely high velocities. On cooling, the wire ceases to move at a temperature of around 1 K. We are unable to detect any motion at lower temperatures, down to below 10 mK.
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