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

G. Gervais·K. Yawata·N. Mulders·W. P. Halperin
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Abstract

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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G. Gervais, K. Yawata, N. Mulders, W. P. Halperin. 2001-12-14. Nucleation and Interfacial Coupling between Pure and Dirty Superfluid Phases of 3He. https://doi.org/10.1103/physrevlett.88.045505

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