Nucleation and Interfacial Coupling between Pure and Dirty Superfluid Phases of 3He

Details Nucleation and Interfacial Coupling between Pure and Dirty Superfluid Phases of 3He Nucleation and Interfacial Coupling between Pure and Dirty Superfluid Phases of 3He

2001-12-14

arxiv.org/abs/cond-mat/0112279v1

Physics

Condensed Matter

4 pages, 4 figures, to be published in Physical Review Letters

Scientific paper

10.1103/PhysRevLett.88.045505

The nucleation of the first order phase transition of superfluid 3He-B from superfluid 3He-A is quite remarkable since it requires a seed of the order of a micron. We have studied this nucleation for 3He confined to a very dilute silica aerogel. This dirty superfluid behaves in a manner similar to previous reports for the pure superfluid. But we have discovered a novel magnetically driven nucleation switch acting on the pure superfluid B-phase. Lastly, we find the surprising result that the proximity effect between the pure and dirty superfluids at their interface is insufficient to nucleate the B-phase in either superfluid.

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