Nucleation of the AB transition in superfluid He3: Surface effects and baked Alaska

P. Schiffer, D. D. Osheroff

Research output: Contribution to journalArticlepeer-review

Abstract

The first-order phase transition between the A and B phases of superfluid 3He has remained an outstanding mystery in helium physics for nearly 20 years. The small difference in bulk free energies between the two phases, combined with the relatively large surface energy associated with the AB interface, leads to an anomalously large critical radius for nucleation, of order 1 μm, suggesting a lifetime for the supercooled A phase against homogeneous nucleation far beyond the age of the universe. Yet anisotropy of the high-temperature phase minimizes the depairing effects of surfaces, thus making conventional heterogeneous nucleation unlikely. Recent experiments have been reported that lend support to one of the more exotic nucleation mechanisms ever proposed: Leggett's "baked Alaska" model, in which the B phase is nucleated by cosmic rays penetrating the supercooled A phase. The results of these experiments are discussed, along with the prospects for future work.

Original languageEnglish (US)
Pages (from-to)491-501
Number of pages11
JournalReviews of Modern Physics
Volume67
Issue number2
DOIs
StatePublished - Jan 1 1995

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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