Electronic Structure of Ce(Pd_<1-x>Cu_x)_3(0≤x≤0.133) Studied by Photoemission and Bremsstrahlung Isochromat Spectroscopy

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We report on X-ray photoemission (XPS), Bremsstrahlung isochromat (BIS) and 4f resonant ultraviolet photoemission (4f RPES or UPS) spectroscopy of Ce(Pd_<1-x>Cu_x)_3(0≤x≤0.133). With increasing x, the 4f^1BIS peak clearly observable in CePd_3 is strongly depressed, the 4f^2BIS peak is found to shift to lower energies and the intensity of the 3d^94f^0 component of the Ce 3d core XPS is found to become weaker. These experimental results are discussed in comparison with the spectra calculated by using the impurity Anderson model. It is found that lowering of the 4f level energy ε_f along with reduction of the 4f hybridization strength V with x can qualitatively reproduce the experimental result. It is also strongly suggested that the 4f-4f Coulomb energies are different for the 4f BIS and 3d XPS final states.
社団法人日本物理学会の論文
1993-10-15