Abstract
It is shown that the pseudodipolar interaction allows to explain static and dynamic properties of non-collinear antiferromagnets R2CuO4 in the temperature range above the rare-earth (RE) ordering temperature. Experimental data for inelastic neutron scattering in Pr2CuO4 are presented. Parameters of the pseudodipolar interactions are determined. Comparison of the spin-wave neutron scattering in Pr2CuO4 and Nd2CuO4 reveals a strong dependence of the in-plane anisotropy on the type of the RE ion. The ground-state energy in magnetic field applied parallel to the CuO2 planes is derived and analyzed. In particular it is shown that the spin-flop transition is of second order if the field is applied along the [1,1,0] direction.
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