Anisotropy of X-ray Absorption Cross Section in CeCoGe3 Single Crystal

Absorption spectra of two orthogonal linearly polarized X-rays in a single CeCoGe3 crystal were measured at the ID12 beamline of the ESRF for the energies near the K-edges of Ge, Co and near the L-23 edges of Ce. The X-ray natural linear dichroism (XNLD) was revealed in the vicinity of all the absorption edges, which indicates a splitting of electronic states in a crystalline field. Mathematical modelling in comparison with experimental data allowed the isotropic and anisotropic parts of atomic absorption cross section in CeCoGe3 to be determined near all measured absorption edges. The calculations also show that the average anisotropy of the cross section close to the Ge K-edge revealed in the experiment is less than the partial anisotropic contributions corresponding to Ge atoms in two different Wyckoff positions.

Automated summary

The absorption spectra of a single CeCoGe3 crystal under two orthogonal linearly polarized X-rays near the K-edges of Ge, Co, and the L-23 edges of Ce were measured at the ID12 beamline of the ESRF. X-ray natural linear dichroism (XNLD) was observed near all absorption edges, indicating a splitting of electronic states in a crystalline field. Mathematical modeling and comparison with experimental data allowed determination of the isotropic and anisotropic parts of atomic absorption cross section in CeCoGe3 near all measured absorption edges, showing different anisotropic contributions from Ge atoms in two different Wyckoff positions.