Abstract
We report bulk 4f and non-4f spectral functions near the Fermi level ( E F ) of a Kondo semiconductor CeRhAs and its related compound CePdSn by virtue of high-resolution soft X-ray photoemission. The non-4f spectrum of CeRhAs measured at 20 K shows a shoulder at the binding energy of ∼ 0.18 eV and almost negligible spectral weight at E F . Although a peak similar to a tail of the Kondo resonance is observed in the 4f spectrum of CeRhAs, the intensity at E F is suppressed compared with those of metallic Ce compounds. These facts are attributed to signatures of the formation of a pseudo-gap in CeRhAs.
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