Persistent-Current Experiments on Superfluid 3He-B and 3He-A

Loading...
Thumbnail Image
Journal Title
Journal ISSN
Volume Title
School of Science | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Date
1984
Major/Subject
Mcode
Degree programme
Language
en
Pages
70-73
Series
Physical Review Letters, Volume 53, Issue 1
Abstract
We have investigated persistent flow of superfluid 3He with an ac gyroscope filled with 20-μm powder. In 3He-B, currents circulate undiminished for 48 h at least; this implies a viscosity 12 orders of magnitude lower than in the normal fluid. In 3He-A, the current does not persist. The observed critical velocity in 3He-B at P<~12 bars is independent of temperature. At P>12 bars there are two regimes in the B phase: For example, at 29.3 bars the ultimate critical velocities are 5.4 and 7.8 mm/s, respectively.
Description
Keywords
superfluids, currents
Other note
Citation
Pekola, Jukka & Simola, J. T. & Nummila, K. K. & Lounasmaa, O. V. & Packard, R. E. 1984. Persistent-Current Experiments on Superfluid 3He-B and 3He-A. Physical Review Letters. Volume 53, Issue 1. P. 70-73. ISSN 0031-9007 (printed). DOI: 10.1103/physrevlett.53.70.