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

[thumbnail of PRL1974BreakingRotonBarrier.pdf]

Preview

PDF (PRL1974BreakingRotonBarrier.pdf)
PRL1974BreakingRotonBarrier.pdf - Published Version
Download (643kB)

Official URL: https://doi.org/10.1103/PhysRevLett.33.1468

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:

Journal Article

Journal or Publication Title:

Physical review letters

Uncontrolled Keywords:

/dk/atira/pure/researchoutput/libraryofcongress/qc

Subjects:

?? PHYSICS AND ASTRONOMY(ALL)QC PHYSICS ??

Departments:

Faculty of Science and Technology > Physics

ID Code:

32528

Deposited By:

Professor P. V. E. McClintock

Deposited On:

12 Apr 2010 13:56

Refereed?:

Yes

Published?:

Published

Last Modified:

24 Oct 2023 00:05

URI:

https://eprints.lancs.ac.uk/id/eprint/32528