Magnetism in 3He

The nuclear magnetic susceptibility, χ, of 3He is seen to nearly obey a pure Curie Law, χ = C/T, over the temperature range 0.5 mK < T < 2 K when contained in the 20Α, multiply connected pores of Vycor glass at low external pressure. Raising the external pressure to 5 bar (1 bar 100 kPa) causes the susceptibility to obey the Curie-Weiss law, χ = C' /T - Θ whose Θ = 0.3 mK. The longitudinal relaxation time, T1, varies monotonically with T between 17 and 90 ms at both pressures. At 5 bar, the transverse relaxation time T2*, is nearly temperature independent (about 600 μs) above 2 mK. Below 2 mK, T2* drops precipitously. Preliminary measurements indicate that the magnetism is produced by atoms that can flow through the pores of the Vycor glass. (10 refs., fig.)