Electronic structure of heavy fermion uranium compounds studied by core-level photoelectron spectroscopy

Shin Ichi Fujimori, Takuo Ohkochi, Ikuto Kawasaki, Akira Yasui, Yukiharu Takeda, Tetsuo Okane, Yuji Saitoh, Atsushi Fujimori, Hiroshi Yamagami, Yoshinori Haga, Etsuji Yamamoto, Yoshifumi Tokiwa, Shugo Ikeda, Takashi Sugai, Hitoshi Ohkuni, Noriaki Kimura, Yoshichika Onuki

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Abstract

High-energy-resolution core-level and valence-band photoelectron spectroscopic studies were performed for the heavy fermion uranium compounds UGe 2, UCoGe, URhGe, URu 2Si 2, UNi 2Al 3, UPd 2, and UPt 3 as well as typical localized and itinerant uranium compounds to understand the relationship between the uranium valence state and their core-level spectral line shapes. In addition to the main line and high-binding energy satellite structure recognized in the core-level spectra of uranium compounds, a shoulder structure on the lower binding energy side of the main lines of localized and nearly localized uranium compounds was also found. The spectral line shapes show a systematic variation depending on the U 5f electronic structure. The core-level spectra of UGe 2, UCoGe, URhGe, URu 2Si 2, and UNi 2Al 3 are rather similar to those of itinerant compounds, suggesting that U 5f electrons in these compounds are well hybridized with ligand states. On the other hand, the core-level spectra of UPd 2Al 3 and UPt 3 show considerably different spectral line shapes from those of the itinerant compounds, suggesting that U 5f electrons in UPd 2Al 3 and UPt 3 are less hybridized with ligand states, leading to the correlated nature of U 5f electrons in these compounds. The dominant final state characters in their core-level spectra suggest that the numbers of 5f electrons in UGe 2, UCoGe, URhGe, URu 2Si 2, UNi 2Al 3, and UPd 2Al 3 are close to but less than three, while that of UPt 3 is close to two rather than to three.

Original languageEnglish
Article number014703
Journaljournal of the physical society of japan
Volume81
Issue number1
DOIs
Publication statusPublished - 2012 Jan 1

Keywords

  • Electronic structure
  • Heavy fermion
  • Photoelectron spectroscopy
  • Uranium compounds

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Fujimori, S. I., Ohkochi, T., Kawasaki, I., Yasui, A., Takeda, Y., Okane, T., Saitoh, Y., Fujimori, A., Yamagami, H., Haga, Y., Yamamoto, E., Tokiwa, Y., Ikeda, S., Sugai, T., Ohkuni, H., Kimura, N., & Onuki, Y. (2012). Electronic structure of heavy fermion uranium compounds studied by core-level photoelectron spectroscopy. journal of the physical society of japan, 81(1), [014703]. https://doi.org/10.1143/JPSJ.81.014703