Calculation of Linear Dichroism in the Ce 4d-Core XAS and 4f Electronic State of CeRh₃B₂

Abstract

Linear dichroism in Ce 4d-core photoabsorption for CeRh₃B₂ with a hexagonal structure is discussed on the basis of an impurity Anderson model. The model takes into account the hybridization between the 4f orbit and conduction band states, multiplets arising from electrostatic interactions between electrons and crystalline anisotropy. In the paramagnetic state of the compound, the difference in the multiplet structure of 4d XAS is calculated between two incident beams with polarizations parallel and perpendicular to the c-axis with varying the crystalline field to increase the occupancy of the 4f state with the azimuthal quantum number m=0. The result shows that the dichroism is a promising characteristic to check recent theoretical predictions on the occupancy of the 4f state with m=0 in CeRh₃B₂ and therefore, to measure the crystal anisotropy.