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Vortex nucleation in He II : an interesting distinction between the intrinsic and thermally activated nucleation mechanisms.

Nancolas, G. G. and Bowley, R. M. and McClintock, Peter V. E. (1996) Vortex nucleation in He II : an interesting distinction between the intrinsic and thermally activated nucleation mechanisms. Journal of Physics C: Solid State Physics, 19 (2). L37-L41. ISSN 0022-3719

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Abstract

The drift velocity of negative ions in He II, moving under the influence of electric fields large enough to quench the production of charged vortex rings, has been measured for a wide range of pressures and temperatures. It is found that, although the intrinsic (temperature-independent) vortex nucleation mechanism provides a major source of momentum loss, particularly at low pressures, the corresponding effect for the thermally activated (temperature-dependent) mechanism is immeasurably small. The underlying physical reasons for this interesting distinction remain unknown but some possible explanations are discussed.

Item Type: Article
Journal or Publication Title: Journal of Physics C: Solid State Physics
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 32359
Deposited By: Professor P. V. E. McClintock
Deposited On: 23 Mar 2010 13:06
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 17:09
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/32359

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