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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 of Low Temperature Physics – Springer Journals
Published: Feb 8, 2012
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