Anisotropy of the Adiabatic Relaxation Time of Adsorbed 3He Monolayer

Abstract

This paper investigates the anisotropy of the adiabatic relaxation time \(T_{2}^{\prime}\) (T2(ω), ω→∞, where ω is the Larmor frequency) of adsorbed monolayer solid 3He. We calculate \(T_{2}^{\prime}\) based on the phenomenological Heisenberg Hamiltonian with the nearest-neighbor and the next nearest-neighbor exchange interactions. Furthermore, the four particle exchange in the triangular plane is also incorporated. To calculate \(T_{2}^{\prime}\), it is necessary to compute the second and the fourth moments of the resonance line \(M_{2}^{0}\) and \(M_{4}^{0}\). To obtain them, we can use the formulas published in previous studies. From the results, we can observe no significant difference between the nearest-neighbor Heisenberg model and the four particle spin interaction models. A comparison of the present results and the experimental data is briefly discussed.