Journal
PHYSICAL REVIEW LETTERS
Volume 107, Issue 23, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.107.235504
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- NSF at Cornell [DMR-0806629]
- NSF at Northwestern [DMR-1103625]
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Motivated by the recent prediction that uniaxially compressed aerogel can stabilize the anisotropic A phase over the isotropic B phase, we measure the pressure dependent superfluid fraction of He-3 entrained in 10% axially compressed, 98% porous aerogel. We observe that a broad region of the temperature-pressure phase diagram is occupied by the metastable A phase. The reappearance of the A phase on warming from the B phase, before superfluidity is extinguished at T-c, is in contrast to its absence in uncompressed aerogel. The phase diagram is modified from that of pure He-3, with the disappearance of the polycritical point (PCP) and the appearance of a region of A phase extending below the PCP of bulk He-3, even in zero applied magnetic field. The expected alignment of the A phase texture by compression is not observed.
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