Simultaneous Measurement of Torsional Oscillation and Ultrasound Propagation in Solid 4He at Low Temperatures

Hein, Bettina; Goodkind, John M.; Iwasa, Izumi; Kojima, H.

doi:10.1007/s10909-012-0734-0

Cited by 6 publications

(2 citation statements)

References 9 publications

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“…1) for studying solid 4 He has been described earlier. 25 It was originally designed to study the ultrasound propagation simultaneously with torsional oscillation response of solid 4 He. This report is focussed on the ultrasound results.…”

Section: Apparatus and Measurement Proceduresmentioning

confidence: 99%

Nonlinear and hysteretic ultrasound propagation in solid He4 : Dynamics of dislocation lines and pinning impurities

Iwasa

Kojima

2020

Phys. Rev. B

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We report on the measurements of 9.6 MHz ultrasound propagation down to 15 mK in polycrystalline quantum solid 4 He containing 0.3 and 20 ppm 3 He impurities. The attenuation and speed of ultrasound are strongly affected by the dislocation vibration. The observed increase in attenuation from 1.2 K to a peak near 0.3 K is independent of drive amplitude and reflects crossover from overdamped to underdamped oscillation of dislocations pinned at network nodes. Below 0.3 K, amplitude-dependent and hysteretic variations are observed in both attenuation and speed. The attenuation decreases from the peak at 0.3 K to a very small constant value below 70 mK at sufficiently low drive amplitudes of ultrasound, while it remains a high value down to 15mK at the highest drive amplitude. The behaviors at low drive amplitudes can be well described by the effects of the thermal pinning and unpinning of dislocations by the impurities. The binding energy between a dislocation line and a 3 He atom is estimated to be 0.35 K. The nonlinear and hysteretic behaviors at intermediate drive amplitudes are analyzed in terms of stress-induced unpinning which may occur catastrophically within a network dislocation segment. The relaxation time for pinning at 15 mK is very short (< 4 s), while more than 1,000 s is required for unpinning.

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Section: Apparatus and Measurement Proceduresmentioning

confidence: 99%

Nonlinear and hysteretic ultrasound propagation in solid He4 : Dynamics of dislocation lines and pinning impurities

Iwasa

Kojima

2020

Phys. Rev. B

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“…The electrode arrays are clamped into place by spring loaded contacts which connect the electrode leads to the amplifier. Spring loaded gold contacts are versatile and robust even at extreme environmental conditions 176 .…”

Section: Recordingsmentioning

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The reconstitution of visual cortical feature selectivity <i>in vitro</i>

Schottdorf¹

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Nonlinear Ultrasound Propagation in Solid $$^4\hbox {He}$$ Compared with Shear Modulus Experiments

Iwasa

Kojima

2016

J Low Temp Phys

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Simultaneous Measurement of Torsional Oscillation and Ultrasound Propagation in Solid 4He at Low Temperatures

Cited by 6 publications

References 9 publications

Nonlinear and hysteretic ultrasound propagation in solid He4 : Dynamics of dislocation lines and pinning impurities

Nonlinear and hysteretic ultrasound propagation in solid He4 : Dynamics of dislocation lines and pinning impurities

The reconstitution of visual cortical feature selectivity <i>in vitro</i>

Nonlinear Ultrasound Propagation in Solid $$^4\hbox {He}$$ Compared with Shear Modulus Experiments

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