Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2011-10-06
Physics
Condensed Matter
Other Condensed Matter
4 pages, 4 figures. Submitted for review to PRL
Scientific paper
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 3He 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 Tc, is in contrast to its absence in uncompressed aerogel. The phase diagram is modified from that of pure 3He, with the disappearance of the polycritical point (PCP) and the appearance of a region of A phase extending below the PCP of bulk 3He, even in zero applied magnetic field. The expected alignment of the A phase texture by compression is not observed.
Bennett Ralph G.
Halperin W. P.
Parpia Jeevak M.
Pollanen Johannes
Smith E. N.
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