Persistent-current experiments on superfluid 3He-B and 3He-A

J. P. Pekola; J. T. Simola; K. K. Nummila; O. V. Lounasmaa; R. E. Packard

doi:10.1103/PhysRevLett.53.70

Persistent-current experiments on superfluid 3He-B and 3He-A

J. P. Pekola^*, J. T. Simola, K. K. Nummila, O. V. Lounasmaa, R. E. Packard

^*Corresponding author for this work

Department of Applied Physics

University of California, Berkeley

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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 P12 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.

Original language	English
Pages (from-to)	70-73
Number of pages	4
Journal	Physical Review Letters
Volume	53
Issue number	1-2
DOIs	https://doi.org/10.1103/PhysRevLett.53.70
Publication status	Published - 2 Jul 1984
MoE publication type	A1 Journal article-refereed

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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 P12 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.",

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AU - Lounasmaa, O. V.

AU - Packard, R. E.

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AB - 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 P12 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.

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Persistent-current experiments on superfluid 3He-B and 3He-A

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