Abstract
Abstract We have performed ultrahigh-resolution (Δ E =8 meV) photoemission spectroscopy to examine the possibility of CePd 3 being a ‘Kondo insulator’ as suggested by a recent optical measurement [Phys. Rev. B 53 (1996) R2948]. We found that the photoemission spectrum of CePd 3 does not show any indication of (pseudo) gap at E F , differing from the well-established temperature-dependent (pseudo) gap in Kondo insulators. The Ce 4 f spectrum clearly shows the ‘Kondo resonance peak’ at E F , indicating the intrinsic metallic nature of CePd 3 . These results strongly suggest that CePd 3 is not a Kondo insulator but a conventional Kondo metal as suggested by thermodynamic measurements.
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