Resonant X-Ray Magnetic Scattering from CoO
arXiv:cond-mat/0008307 · doi:10.1143/JPSJ.69.4087
Abstract
We analyze the recent experiment [W. Neubeck {\em et al.}, Phys. Rev. B \vol(60,1999,R9912)] for the resonant x-ray magnetic scattering (RXMS) around the K edge of Co in the antiferromagnet CoO. We propose a mechanism of the RXMS to make the states couple to the magnetic order: the intraatomic exchange interaction between the and the states and the - mixing to the states of neighboring Co atoms. These couplings induce the orbital moment in the states and make the scattering tensor antisymmetric. Using a cluster model, we demonstrate that this modification gives rise to a large RXMS intensity in the dipole process, in good agreement with the experiment. We also find that the pre-edge peak is generated by the transition to the states in the quadrupole process, with negligible contribution of the dipole process. We also discuss the azimuthal angle dependence of the intensity.
15 pages, 8 figures