Abstract
Impurity-substituted Kondo semiconductors Yb1−xLuxB12 and Sm1−yEuyB12 have been studied by the highly bulk-sensitive hard x-ray (hv ~ 8 keV) photoelectron spectroscopy. The valence-band spectra for Yb1−xLuxB12 have been analyzed by the single-impurity Anderson model (SIAM). The temperature dependence of the bulk Yb 4/ peak positions for x = 0 cannot be interpreted within the SIAM, whereas that for x = 1/8 could be understood by the SIAM. This suggests that the Kondo lattice coherence, which is essential for pure YbB12, collapses due to the substitution of x = 1/8. For Smi1−yEuyB6, the y dependence of the Sm and Eu 3d core-level spectra has been systematically examined. We have found that the Sm valence increases with y due to the reduction of the hybridization between the Sm 4f and valence-bands.
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