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 0921-4526Full text not available from this repository.
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.
|Journal or Publication Title:||Physica B: Condensed Matter|
|Subjects:||Q Science > QC Physics|
|Departments:||Faculty of Science and Technology > Physics|
|Deposited On:||24 Oct 2012 10:28|
|Last Modified:||18 Jun 2015 06:05|
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