Zero-sound attenuation in rotating and stationary3He-A and3He-B

J. M. Kyynäräinen; J. P. Pekola; K. Torizuka; A. J. Manninen; A. V. Babkin

doi:10.1007/BF00681423

Zero-sound attenuation in rotating and stationary³He-A and³He-B

J. M. Kyynäräinen, J. P. Pekola, K. Torizuka, A. J. Manninen, A. V. Babkin

Not published at VTT

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Abstract

We report on measurements of zero-sound attenuation in rotating and stationary³He-A and³He-B, in magnetic fields up to 350 mT. Strong and highly nonlinear rotation speed dependencies of sound amplitudes have been observed in both phases. The data gives information on vortex types and core sizes, although the analysis is not straightforward. The anomalous attenuation in³He-B at 200 mT near the AB transition, both in the stationary and in the rotating state, is interpreted to arise from the distortion of the energy gap of the B phase. Excess attenuation during the AB phase change was observed. Evidence for soft vortex cores in³He-B is presented. In addition, a critical velocity in the vortex free state, related to a textural transition, and the vortex creation times have been measured in³He-B. Furthermore, a metastable structure, possibly a new vortex state, has been observed in³He-B by rotating the sample through the A → B transition.

Original language	English
Pages (from-to)	325-367
Number of pages	43
Journal	Journal of Low Temperature Physics
Volume	82
Issue number	5-6
DOIs	https://doi.org/10.1007/BF00681423
Publication status	Published - Mar 1991
MoE publication type	A1 Journal article-refereed

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title = "Zero-sound attenuation in rotating and stationary3He-A and3He-B",

abstract = "We report on measurements of zero-sound attenuation in rotating and stationary3He-A and3He-B, in magnetic fields up to 350 mT. Strong and highly nonlinear rotation speed dependencies of sound amplitudes have been observed in both phases. The data gives information on vortex types and core sizes, although the analysis is not straightforward. The anomalous attenuation in3He-B at 200 mT near the AB transition, both in the stationary and in the rotating state, is interpreted to arise from the distortion of the energy gap of the B phase. Excess attenuation during the AB phase change was observed. Evidence for soft vortex cores in3He-B is presented. In addition, a critical velocity in the vortex free state, related to a textural transition, and the vortex creation times have been measured in3He-B. Furthermore, a metastable structure, possibly a new vortex state, has been observed in3He-B by rotating the sample through the A → B transition.",

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year = "1991",

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T1 - Zero-sound attenuation in rotating and stationary3He-A and3He-B

AU - Kyynäräinen, J. M.

AU - Pekola, J. P.

AU - Torizuka, K.

AU - Manninen, A. J.

AU - Babkin, A. V.

PY - 1991/3

Y1 - 1991/3

N2 - We report on measurements of zero-sound attenuation in rotating and stationary3He-A and3He-B, in magnetic fields up to 350 mT. Strong and highly nonlinear rotation speed dependencies of sound amplitudes have been observed in both phases. The data gives information on vortex types and core sizes, although the analysis is not straightforward. The anomalous attenuation in3He-B at 200 mT near the AB transition, both in the stationary and in the rotating state, is interpreted to arise from the distortion of the energy gap of the B phase. Excess attenuation during the AB phase change was observed. Evidence for soft vortex cores in3He-B is presented. In addition, a critical velocity in the vortex free state, related to a textural transition, and the vortex creation times have been measured in3He-B. Furthermore, a metastable structure, possibly a new vortex state, has been observed in3He-B by rotating the sample through the A → B transition.

AB - We report on measurements of zero-sound attenuation in rotating and stationary3He-A and3He-B, in magnetic fields up to 350 mT. Strong and highly nonlinear rotation speed dependencies of sound amplitudes have been observed in both phases. The data gives information on vortex types and core sizes, although the analysis is not straightforward. The anomalous attenuation in3He-B at 200 mT near the AB transition, both in the stationary and in the rotating state, is interpreted to arise from the distortion of the energy gap of the B phase. Excess attenuation during the AB phase change was observed. Evidence for soft vortex cores in3He-B is presented. In addition, a critical velocity in the vortex free state, related to a textural transition, and the vortex creation times have been measured in3He-B. Furthermore, a metastable structure, possibly a new vortex state, has been observed in3He-B by rotating the sample through the A → B transition.

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JO - Journal of Low Temperature Physics

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IS - 5-6

ER -

Zero-sound attenuation in rotating and stationary³He-A and³He-B

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