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Temperature-dependent vortex nucleation in isotopically pure superfluid 4He.

Nancolas, G. G. and McClintock, Peter V. E. and Moss, F. E. and Bowley, R. M. (1981) Temperature-dependent vortex nucleation in isotopically pure superfluid 4He. Journal of Physics C: Solid State Physics, 14. L681-L686. ISSN 0022-3719

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Abstract

We have investigated the temperature dependence of the rate nu which negative ions nucleate vortex rings in isotopically pure superfluid 4He. Measurements of nu(E,T) are presented for a pressure of 23 bar with electric fields E in 5.8 < E < 1.2 x l0^6 V m-l and temperatures T in 0.3 < T < 0.8 K. Provided that due allowance is made for the drag arising from ion-excitation scattering, (nu - nu0) is proportional to Nr, where Nr is the thermal roton density and nu0 is the temperature-dependent limiting value of nu below 0.5 K. We show that this discovery is consistent with the existence of an additional vortex nucleation mechanism, characterised by a critical velocity reduced by roton absorption, but ultimately determined by a requirement for the conservation of energy and momentum.

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: 32486
Deposited By: Professor P. V. E. McClintock
Deposited On: 12 Apr 2010 08:53
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 17:11
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/32486

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