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Theory of pair breaking by vibrating macroscopic objects in superfluid 3He

Lambert, Colin (1992) Theory of pair breaking by vibrating macroscopic objects in superfluid 3He. Physica B: Condensed Matter, 178 (1-4). pp. 294-303. ISSN 0921-4526

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Abstract

An intuitive picture of dissipation through pair breaking by macroscopic, vibrating objects in an isotropic superfluid is presented, which predicts a critical velocity for direct quasi-particle emission of upsilon(c) = upsilon-0/(1 + alpha), where upsilon-0 is the Landau velocity and alpha characterizes the superfluid backflow. A new intermediate frequency regime is identified, in which pulsed experiments should reveal a hierarchy of critical velocities and sinusoidally vibrating objects will exhibit a crossover to diffusive behaviour. A model of flow through a channel with a rough surface is analyzed, which yields for the instantaneous dissipation Q approximately (upsilon - upsilon(c))5 and Q approximately upsilon-2, at low and high velocities, respectively.

Item Type: Article
Journal or Publication Title: Physica B: Condensed Matter
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 58123
Deposited By: ep_importer_pure
Deposited On: 24 Oct 2012 10:28
Refereed?: Yes
Published?: Published
Last Modified: 10 Apr 2014 00:08
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/58123

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