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High-resolution photoemission study of Ce$$_{1-x}$$La$$_{x}$$RhAs; A Collapse of the energy gap in the Kondo semiconductor

Shimada, Kenya*; Higashiguchi, Mitsuharu*; Fujimori, Shinichi   ; Saito, Yuji  ; Fujimori, Atsushi; Namatame, Hirofumi*; Taniguchi, Masaki*; Sasakawa, Tetsuya*; Takabatake, Toshiro*

High-resolution resonance-photoemission spectroscopy has been performed on the Ce$$_{1-x}$$La$$_{x}$$RhAs (0$$leq$$x$$leq$$0.05) single crystal to elucidate a collapse of the energy gap in the Kondo semiconductor CeRhAs by La substitution. With increasing x, the spectral intensity of the Ce 4f$$^{1}$$ derived states near the Fermi level decreases and new 4f derived spectral feature appears at a higher binding energy. The Rh 4d-derived states, on the other hand, are not significantly changed by the substitution. New 4f-derived states have incoherent nature, which is responsible for the collapse of the semiconducting state for x$$>$$$$sim$$0.02.



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Category:Physics, Condensed Matter



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