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Dependence of the spectral functions on temperature and rare-earthsubstitution was examined in detail for Kondo semiconductor alloys Sm1-xEuxB6and Yb1-xLuxB12 by bulk-sensitive photoemission. It is found that the 4flattice coherence and intrinsic (small) energy gap are robust for SmB6 againstthe Eu substitution up to x = 0.15 while both collapse by Lu substitutionalready at x = 0.125 for YbB12. Our results suggest that the mechanism of theintrinsic gap formation is different between SmB6 and YbB12 although they wereso far categorized in the same kind of Kondo semiconductors.

Different Evolution of Intrinsic Gap in Kondo Semiconductors SmB6 and YbB12