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J. Phys. Soc. Jpn. 65, pp. 2685-2689 (1996) [5 Pages]
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High-Resolution Photoemission Study of UNi 2Al 3 and URu 2Si 2

See-Hun Yang1,2, Hiroshi Kumigashira1, Takayoshi Yokoya1, Ashishi Chainani1, Takashi Takahashi1, Se-Jung Oh2, Noriaki Sato1, and Takemi Komatsubara1
+ Affiliations
1Department of Physics, Tohoku University, Sendai 980-77 2Department of Physics, Seoul National University, Seoul 151-742, Korea
Received March 5, 1996

High-resolution low-temperature photoemission spectroscopy has been performed for UNi 2 Al 3 and URu 2 Si 2 to study the nature of 5 f electrons in U-based heavy fermion materials. Photo- emission spectra of both compounds have a sharp peak at E F and a large broad peak around 2 eV, while only UNi 2 Al 3 exhibits an additional small broad feature at 0.6 eV. The two features in the vicinity of E F (the E F -peak and the small structure at 0.6 eV) are found to have a dominant U 5 f character while the prominent peak around 2 eV is due to the Ni 3 d or Ru 4 d states. Comparison with the band structure calculations and experimental results on UPd 2 Al 3 suggests that the E F -peak is ascribed to itinerant U 5 f electrons while the following broad feature at 0.6 eV represents localized f electrons.

©1996 The Physical Society of Japan
https://doi.org/10.1143/JPSJ.65.2685
KEYWORDS: high-resolution photoemission spectroscopy, uranium compounds, 5felectrons, electronic structure

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