Abstract
Spin-spin relaxation time (T2) and magnetic susceptibility (χ) of the second layer 3He adsorbed on Grafoil, exfoliated graphite, preplated with a monolayer 4He are studied by pulsed-NMR in a density range of 0.68 ≤ ρ ≤ 5.28 nm−2. The temperature dependence of χ(T) and χ(T = 0) show Fermi fluid behaviour and no evidence of self-condensation are found even at the lowest density ρ = 0.68 nm−2. Density dependence of T2 at f = 5.5 MHz shows a broad maximum of 5.7 ms around ρ = 3 nm−2. Since the decrease of T2 in dilute side can not be expected in the ideal 2D fluid, it can be understood as the relaxation caused by a small amount of solid 3He at heterogeneity of the substrate. We also measured the Larmor frequency dependence of T2 at ρ = 5.28 nm−2. 1/T2 has a f-linear dependence similarly to the earlier study on a first layer solid 3He [14]. From a comparison between our result and the earlier one, this linearity is almost independent of the particle motion. Now, it could be caused by a microscopic magnetic field inhomogeneity arisen from the mosaic angle spread and diamagnetism of the graphite substrate.
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