Possibility of a reduced description for the spin dynamics of anisotropic Heisenberg paramagnets and the shape of NMR spectra in solids

Abstract

The problem of the shape of the NMR line in solids has been solved in quadratures. Although the constructed solution is based on exact results obtained by the authors, the possibility for a correct description of experimental data on the basis of lower approximations of the theory essentially depends on the crystal lattice type. Only the spectra of crystals with ordinary dense lattices (rather than, e.g., quasi-one-dimensional systems) can be adequately described in lower approximations, which is a very urgent problem. Comparison of theoretical and experimental results has resulted in good agreement.