CIRCULAR-DICHROISM IN THE 3D AND 4D CORE PHOTOABSORPTION FOR FERROMAGNETIC CE COMPOUNDS - INTERPLAY OF HYBRIDIZATION, SPIN ORBIT INTERACTION AND CRYSTAL-FIELD

The Ce 3d- and 4d-core photoabsorption spectra (3d XAS and 4d XAS) of ferromagnetic mixed valent Ce compounds are calculated on the basis of the impurity Anderson model. The model takes into account the Coulomb interaction producing multiplet structures, the spin-orbit interaction, the crystal field effect and the molecular field acting on the 4f spin. The calculation shows a strong circular dichroism even for the Ce magnetic moment of ~0.5 µB. The dichroism is further-more shown to be a powerful method to measure the spin and orbital contributions to the 4f moment. On the basis of the calculation, the 4f magnetic state of the fer-romagnet CeRh3B2 is discussed. © 1990, THE PHYSICAL SOCIETY OF JAPAN. All rights reserved.