Orbital damping of the oscillating superfluid He A-B interface at low temperatures

Arrayas, M. and Fisher, S. N. and Haley, R. P. and Pickett, G. R. and Skyba, M. (2014) Orbital damping of the oscillating superfluid He A-B interface at low temperatures. Journal of Low Temperature Physics, 175 (5-6). pp. 706-717. ISSN 0022-2291

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We present a model for the friction and effective mass of an oscillating superfluid He A-B interface due to orbital viscosity in the B-phase texture close to the interface. The model is applied to an experiment in which the A-B interface was stabilised in a magnetic field gradient at the transition field mT at 0 bar pressure and at a very low temperature mK. The interface was then oscillated by applying a small additional field at frequencies in the range 0.1-100 Hz. The response of the interface is governed by friction and by its effective mass. The measured dissipation does not fit theoretical predictions based either on the Andreev scattering of thermal quasiparticles or by pair-breaking from the moving interface. We describe a new mechanism based on the redistribution of thermal quasiparticle excitations in the B-phase texture engendered by the moving interface. This gives rise to friction via orbital viscosity and generates a significant effective mass of the interface. We have incorporated this mechanism into a simple preliminary model which provides reasonable agreement with the measured behaviour.

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Journal Article
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Journal of Low Temperature Physics
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© The Author(s) 2014. This article is published with open access at Springerlink.com
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25 Jul 2014 09:05
Last Modified:
28 May 2023 02:30