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:
Journal Article
Journal or Publication Title:
Physica B: Condensed Matter
Uncontrolled Keywords:
/dk/atira/pure/researchoutput/libraryofcongress/qc
Subjects:
ID Code:
58123
Deposited By:
Deposited On:
24 Oct 2012 09:28
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 08:07