Abstract
For pt.I see ibid., vol.19, p.2275 (1986). The authors describe two approximate methods for the study of rotating transverse helimagnetism in high field in CaF2: the random phase approximation (RPA) and a physical model based on the fact that the Weiss field at any nuclear site is produced by distant spins. Both methods predict the helical structure to be stable in zero effective field, and the physical model predicts the occurrence of a mixed longitudinal and transverse phase in non-zero effective field. The rate of thermal mixing upon irradiation of the rare 43Ca spins with the 19F spins is analysed through RPA, and the shape of the NMR line of the ordered 19F spins is analysed through the physical model.
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