title: Modification of the 3He phase diagram by anisotropic disorder.
abstract: 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 (3)He 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 (3)He, with the disappearance of the polycritical point (PCP) and the appearance of a region of A phase extending below the PCP of bulk (3)He, even in zero applied magnetic field. The expected alignment of the A phase texture by compression is not observed.
authors.affiliation: Department of Physics, Cornell University, Ithaca, New York 14853, USA.
authors.forename: R G
authors.initials: RG
authors.lastname: Bennett
authors.forename: N
authors.initials: N
authors.lastname: Zhelev
authors.forename: E N
authors.initials: EN
authors.lastname: Smith
authors.forename: J
authors.initials: J
authors.lastname: Pollanen
authors.forename: W P
authors.initials: WP
authors.lastname: Halperin
authors.forename: J M
authors.initials: JM
authors.lastname: Parpia