We present the results of resonant x-ray scattering experiments on KCuF3. Structurally forbidden reflections, corresponding to magnetic and 3d-orbital long-range order, have been observed. Integrated intensities have been measured as a function of incident energy, polarization, azimuthal angle, and temperature. By means of ab initio local spin density approximation (LSDA) and local spin density approximation with on-site Coulomb interaction (LSDA+U) calculations we determine the electronic structure of KCuF3 and obtain the resonant x-ray scattering spectrum at the Cu K edge, which shows good agreement with the experimental data. Orbital and spin degrees of freedom are strongly coupled, and the temperature dependence of the intensity of orbital Bragg peaks reveals a correlation between magnetic and orbital order parameters.
|Number of pages||9|
|Journal||Physical review B: Condensed matter and materials physics|
|Publication status||Published - 2002|
Caciuffo, R., Paolasini, L., Sollier, A., Ghigna, P., Pavarini, E., van den Brink, J., & Altarelli, M. (2002). Resonant x-ray scattering study of magnetic and orbital order in KCuF3. Physical review B: Condensed matter and materials physics, 65(17), 174425/1-174425/9. https://doi.org/10.1103/PhysRevB.65.174425