TEMPERATURE-DEPENDENCE OF 2P-CORE X-RAY ABSORPTION-SPECTRA IN 3D TRANSITION-METAL COMPOUNDS

The temperature dependence of the V and Co 2p-core X-ray absorption spectra (2p XAS) in VF3 and CoF2, respectively, are discussed on the basis of an atomic model including multiplet-splitting, 3d spin-orbit interaction and crystalline field. The recent high-resolution 2p XAS data for VF3 and CoF2 are shown to be well explained by assuming the crystalline field with cubic symmetry in the former and with the orthorhombic (D2h) Symmetry in the latter and by assuming T=300 K for both systems. For CoF2, the temperature dependence of the Co 2p XAS for the linearly polarized incident beams both parallel and perpendicular to the c axis is predicted to be much more remarkable than that for unpolarized light.