Resonant X-Ray Scattering from CeB_6

概要

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We calculate the resonant x-ray scattering (RXS) spectra near the Ce L_<lll> absorption edge in CeB_6, on the basis of a microscopic model that the 4f states of Ce are atomic while the 5d states form an energy band with a reasonable density of states. In the initial state, we employ an effective Hamiltonian of Shiina et al. [J. Phys. Soc. Jpn. 66 (1997) 1741] in the antiferro-quadrupole (AFQ) ordering phase, while we construct the wave function consistent with the neutron scattering experiment in the magnetic ground state. In the intermediate state, we take full account of the intra-atomic Coulomb interaction. Without assuming any lattice distortion, we obtain sufficient RXS intensities on the AFQ superlattice spot. We obtain the spectral shape, the temperature and magnetic field dependences in good agreement with the experiment, thus demonstrating the mechanism that the intensity is brought about by the modulation of 5d states through the anisotropic term of the 5d-4f Coulomb interaction. In the magnetic ground state, a small pre-edge peak is found by the E_2 process. On the magnetic superlattice spot, we get a finite but considerably small intensity. The magnetic form factor is briefly discussed.
社団法人日本物理学会の論文
2002-07-15