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Breaking the roton barrier: An experimental study of motion faster than the Landau critical velocity for roton creation in He II.

Phillips, A. and McClintock, Peter V. E. (1974) Breaking the roton barrier: An experimental study of motion faster than the Landau critical velocity for roton creation in He II. Physical Review Letters, 33 (25). pp. 1468-1471. ISSN 1079-7114

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Abstract

We report the first observation of objects moving through He II with equilibrium drift velocities v beyond the Landau critical velocity vc,for roton creation. With T about 0.4 K, P = 25 bar, F =2 kV/cm, (v - vc) for negative ions is larger than a theoretical prediction by a factor of about 10^5. The vortex-ring nucleation rate is found to decrease with F above 300 V/cm, thus resolving apparent inconsistencies between earlier experiments.

Item Type: Article
Journal or Publication Title: Physical Review Letters
Subjects: Q Science > QC Physics
Departments: Faculty of Science and Technology > Physics
ID Code: 32528
Deposited By: Professor P. V. E. McClintock
Deposited On: 12 Apr 2010 14:56
Refereed?: Yes
Published?: Published
Last Modified: 26 Jul 2012 17:12
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/32528

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