High-Resolution Photoemission Study of UNi2Al3 and URu2Si2

See Hun Yang, Hiroshi Kumigashira, Takayoshi Yokoya, Ashishi Chainani, Takashi Takahashi, Se Jung Oh, Noriaki Sato, Takemi Komatsubara

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10 Citations (Scopus)


High-resolution low-temperature photoemission spectroscopy has been performed for UNi2Al3 and URu2Si2 to study the nature of 5f electrons in U-based heavy fermion materials. Photoemission spectra of both compounds have a sharp peak at EF and a large broad peak around 2 eV, while only UNi2Al3 exhibits an additional small broad feature at 0.6 eV. The two features in the vicinity of EF (the EF-peak and the small structure at 0.6 eV) are found to have a dominant U 5f character while the prominent peak around 2 eV is due to the Ni 3d or Ru 4d states. Comparison with the band structure calculations and experimental results on UPd2Al3 suggests that the EF-peak is ascribed to itinerant U 5f electrons while the following broad feature at 0.6 eV represents localized f electrons.

Original languageEnglish
Pages (from-to)2685-2689
Number of pages5
JournalJournal of the Physical Society of Japan
Issue number8
Publication statusPublished - 1996


  • 5f electrons
  • Electronic structure
  • High-resolution photoemission spectroscopy
  • Uranium compounds


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