Resonant x-ray scattering study of magnetic and orbital order in KCuF3

نویسندگان

  • R. Caciuffo
  • P. Ghigna
  • E. Pavarini
چکیده

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 ~LSDA1U! 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.

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تاریخ انتشار 2002