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Shimada, Kenya*; Higashiguchi, Mitsuharu*; Arita, Masashi*; Namatame, Hirofumi*; Taniguchi, Masaki*; Fujimori, Shinichi; Saito, Yuji; Fujimori, Atsushi; Takata, Yasutaka*; Shin, S.*; et al.
Journal of Magnetism and Magnetic Materials, 310(2, Part1), p.e57 - e58, 2007/03
We have examined the electronic states of the Kondo semiconductor CeRhAs and the semimetal CeRhSb by means of high-resolution photoemission spectroscopy using tunable photon energies from 40 up to 5948 eV. On the basis of the photon-energy dependence ofthe photoionization cross-section, we have elucidated the p-d-f hybridized states in these compounds.
La
RhAs; A Collapse of the energy gap in the Kondo semiconductorShimada, Kenya*; Higashiguchi, Mitsuharu*; Fujimori, Shinichi; Saito, Yuji; Fujimori, Atsushi; Namatame, Hirofumi*; Taniguchi, Masaki*; Sasakawa, Tetsuya*; Takabatake, Toshiro*
Physica B; Condensed Matter, 383(1), p.140 - 141, 2006/08
Times Cited Count：1 Percentile：6.64(Physics, Condensed Matter)High-resolution resonance-photoemission spectroscopy has been performed on the CeLaRhAs (0
x0.05) 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
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
0.02.
Shimada, Kenya*; Namatame, Hirofumi*; Taniguchi, Masaki*; Higashiguchi, Mitsuharu*; Fujimori, Shinichi; Saito, Yuji; Fujimori, Atsushi; Kim, M. S.*; Hirata, Daisuke*; Takabatake, Toshiro*
Physica B; Condensed Matter, 378-380, p.791 - 792, 2006/05
Times Cited Count：4 Percentile：22.76(Physics, Condensed Matter)The Ce 4f-derived states in CeRhX (X=Sn and In) were directly examined by means of high-resolution 3d-4f resonance photoemission spectroscopy. Compared with the Kondo metal CePtSn, which has a low Kondo temperature, CeRhX has a strong Ce 4f weight near the Fermi level (
) and has a weak Ce 4f
peak, indicating a strong valence fluctuation. The Ce 4f spectral features indicate that the c-f hybridization strength in CeRhSn is weaker than that in CeRhIn.
