Bulk-Sensitive Photoemission Spectroscopy for Heavy-Fermion Pr Compounds Using Hard X-Ray(Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

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Bulk-sensitive photoemission spectroscopy using hard x-ray up to hν=5450eV has been performed for heavy-fermion Pr compounds. A significant spectral intensity of the |3d^94f^3> final state was observed in Pr 3d core-level spectra of PrFe_4P_<12> at both hν=2450 and 5450eV. The spectra obtained by the configuration-interaction cluster model calculation reproduce the experimental spectra for well-hybridized PrFe_4P_<12> and localized Pr metal. Results of the calculations suggest that the Kondo behavior observed in PrFe_4P_<12> arise from the mixing of the |4f^2> and |4f^3> configurations due to the c-f hybridization. Whereas a contribution possibly from a disordered surface to the spectrum can be negligible for the fractured PrFe_4P_<12>, they cannot be disregarded for the scraped PrSn_3 and Pr metal even in the high-energy x-ray region.
一般社団法人日本物理学会の論文
2005-07-15