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Hysteretic Response of Torsionally Oscillated Solid 4He and Its Dependence on 3He Impurity Concentration

Hysteretic Response of Torsionally Oscillated Solid 4He and Its Dependence on 3He Impurity... Measurements on hysteretic response of compound torsional oscillator containing annular-shaped solid 4He samples were carried out by varying the oscillator drive amplitude starting from high to low and then back up to the initial high value. Hysteresis in the oscillator frequency and amplitudes were observed only below an onset temperature. The hysteresis onset temperature (T H ) did not depend on the oscillator frequency, width of the sample annulus, annealing and refreezing after melting. A systematic increase in T H was observed as the 3He impurity concentration in solid 4He samples was increased. The dependence of T H on 3He impurity concentration followed approximately that of the dissipation peak temperatures. Possible relationships of the observed hysteresis phenomena with models of solid 4He dynamics based on freezing of a vortex liquid and dislocation motion are discussed. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Low Temperature Physics Springer Journals

Hysteretic Response of Torsionally Oscillated Solid 4He and Its Dependence on 3He Impurity Concentration

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Publisher
Springer Journals
Copyright
Copyright © 2012 by Springer Science+Business Media, LLC
Subject
Physics; Magnetism, Magnetic Materials; Characterization and Evaluation of Materials; Condensed Matter Physics
ISSN
0022-2291
eISSN
1573-7357
DOI
10.1007/s10909-012-0581-z
Publisher site
See Article on Publisher Site

Abstract

Measurements on hysteretic response of compound torsional oscillator containing annular-shaped solid 4He samples were carried out by varying the oscillator drive amplitude starting from high to low and then back up to the initial high value. Hysteresis in the oscillator frequency and amplitudes were observed only below an onset temperature. The hysteresis onset temperature (T H ) did not depend on the oscillator frequency, width of the sample annulus, annealing and refreezing after melting. A systematic increase in T H was observed as the 3He impurity concentration in solid 4He samples was increased. The dependence of T H on 3He impurity concentration followed approximately that of the dissipation peak temperatures. Possible relationships of the observed hysteresis phenomena with models of solid 4He dynamics based on freezing of a vortex liquid and dislocation motion are discussed.

Journal

Journal of Low Temperature PhysicsSpringer Journals

Published: Feb 8, 2012

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