SPIN-WAVE SPECTRUM AND INELASTIC NEUTRON-SCATTERING BY MAGNONS IN ND2CUO4

The spin-wave spectrum of the Nd2CuO4 exchange-noncollinear four-subla ttice antiferromagnet has been investigated theoretically. It is shown that there exists a quasi-two-dimensionality of the spin-wave spectru m when the wave vector is oriented along a certain direction. This qua si-two-dimensionality originates from a specific crystal and magnetic symmetry of Nd2CuO4 and is in no way connected with the small values o f some exchange parameters in comparison with others. Further, the ine lastic neutron scattering by magnons in Nd2CuO4 has been considered an d the effects of the exchange enhancement of the scattering intensitie s for some particular Bragg peaks are analyzed.