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

Research output: Contribution to journalArticleScientificpeer-review


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

Research units

  • University of California at Berkeley


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 languageEnglish
Pages (from-to)70-73
Number of pages4
JournalPhysical Review Letters
Issue number1-2
Publication statusPublished - 2 Jul 1984
MoE publication typeA1 Journal article-refereed

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