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| Valence Band Photoemission Study of the Kondo Insulator CeNiSn |
| Journal of Magnetics, Volume 2, Number 4, 31 Dec 1997, Pages 111-115 |
| J.S. Kang(Department of Physics, The Catholic University of korea), C.G. Olson(Ames Laboratory, Iowa State University), Y. Ouki(Faculty of Science, Osaka University) |
| Abstract |
| The electronic structure of the Kondo insulator CeNiSn has been investigated by using photoemission spectroscopy. A satellite feature is observed in the valence band spectrum about 6 eV below the Ni 3d main peak, indicating a strong Ni 3d Coulomb correlation in CeNiSn. The Ce 4f partial spectral weight exhibits three peak structures, including one due to the 4f1 → 4f0 transition, another near EF, and the other which overlaps the Ni 3d main peak. We interpret the peak near EF as reflecting mainly the Ce 4f/Sn 5p hybridization, whereas that around the ni 3d main peak as reflecting both the Ce 4f/Ni 3d and Ce 5d/Ni 3d hybridization. Yield measurements across the 4d → 4f threshold indicate the Ce valence to be close to 3+. The prominent Fermi edge suggests a metallic ground state in CeNiSn. |
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