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The nucleation of the first order phase transition of superfluid 3He-B fromsuperfluid 3He-A is quite remarkable since it requires a seed of the order of amicron. We have studied this nucleation for 3He confined to a very dilutesilica aerogel. This dirty superfluid behaves in a manner similar to previousreports for the pure superfluid. But we have discovered a novel magneticallydriven nucleation switch acting on the pure superfluid B-phase. Lastly, we findthe surprising result that the proximity effect between the pure and dirtysuperfluids at their interface is insufficient to nucleate the B-phase ineither superfluid.Comment: 4 pages, 4 figures, to be published in Physical Review Letter

physical review letters

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Nucleation and Interfacial Coupling between Pure and Dirty Superfluid Phases ofH3e