We report nuclear magnetic resonance (NMR) measurements of superfluid 3He confined in 98% porosity aerogel.* 3He superfluidity in aerogel has been identified as an equal-spin pairing superfluid with a transition temperature, Te, suppressed from that of the bulk. In magnetic fields, 0.38 ≤ H ≤ 2.2 kOe, Tc is further suppressed by 61 ± 1 μK/kOe2 at 18.7 bar. Such a quadratic magnetic field dependence of the superfluid transition is unexpected for an equal-spin pairing state. The effects of small additions of 4He on the NMR frequency shifts and on the phase diagram are described.
ASJC Scopus subject areas
- Physics and Astronomy(all)