title: Phase diagram of the A and B phases of superfluid 3He in aerogel.
abstract: We report the first measurements of the A-B phase transition of superfluid 3He confined within 98% silica aerogel in high magnetic fields and low temperatures. A disk of aerogel is attached to a vibrating wire resonator. The resonant frequency yields a measure of the superfluid fraction rho(s)/rho of the 3He within the aerogel. The inferred rho(s)/rho value increases substantially at the A-to- B transition of the confined superfluid, allowing us to map the A-B phase diagram as a function of field and temperature. At 4.8 bars, the B-T transition curve looks very similar to that in bulk with a simple reduction factor of order 0.45 for both transition field and temperature.
authors.affiliation: Department of Physics, Lancaster University, Lancaster, LA1 4YB United Kingdom.
authors.forename: P
authors.initials: P
authors.lastname: Brussaard
authors.forename: S N
authors.initials: SN
authors.lastname: Fisher
authors.forename: A M
authors.initials: AM
authors.lastname: Guénault
authors.forename: A J
authors.initials: AJ
authors.lastname: Hale
authors.forename: N
authors.initials: N
authors.lastname: Mulders
authors.forename: G R
authors.initials: GR
authors.lastname: Pickett