Theory of XMCD spectra at the L2,3 absorption edges of mixed valence Ce and Yb compounds in high magnetic fields

XAS and XMCD spectra at the L-2,L-3 absoption edges of mixed valence Ce and Yb compounds are calculated in high magnetic fields ranging from 10 to 1000T and at zero temperature by using a new theoretical framework proposed very recently by the present author. The XMCD spectra exhibit a peak only for the 4f(1) (for Ce) and 4f(13) (for Yb) final states. Available experimental data for CePd3 at 7T is reasonably well explained. With a further increase in the magnetic field strength, the Kondo bound state becomes unstable, and concomitantly the XMCD spectra behave in a different way from those at low magnetic fields. One of the most striking behavior is the field-dependence of the L-2 XMCD intensity of the Yb system; the XMCD intensity first increases with the magnetic field strength, but decreases as the Kondo bound state becomes unstable.