Abstract
We reexamine the mechanism of the x-ray diffraction process by including the Thomson scattering (TS) term in addition to the resonant x-ray scattering (RXS) term previously evaluated by the present authors near the Ce L III absorption edge in the antiferroquadrupole (AFQ) ordering phase of CeB 6 . Assuming the AFQ order in the 4 f states but without any lattice distortion, we obtain the TS intensity comparable to the RXS intensity, owing to the anisotropic charge distribution of 4 f states. The present calculation reproduces well the interference pattern between the TS and RXS terms for the \((\frac{5}{2}\frac{3}{2}\frac{3}{2})\) spot observed in the recent experiment. The results suggest that the TS signal as well as the main-peak of the RXS signal are a direct reflection of the AFQ order in CeB 6 . In addition, we add the analysis of the temperature and external field dependences of the TS intensity, which may be utilized in determining the possible type of the order parameter.
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