Photoemission evidence for valence fluctuations and Kondo resonance in YbAl 2

Masaharu Matsunami, Ashish Chainani, Munetaka Taguchi, Ritsuko Eguchi, Yasutaka Takata, Masaki Oura, Makina Yabashi, Kenji Tamasaku, Yoshinori Nishino, Tetsuya Ishikawa, Masashi Kosaka, Shik Shin

Research output: Contribution to journalReview articlepeer-review

10 Citations (Scopus)


We use hard x-ray photoemission spectroscopy (HAXPES) to investigate the electronic structure of YbAl 2, for which the Yb valence has not been consistently reported to date. The bulk sensitivity and the analytical simplicity provided by the Yb 3d core-level HAXPES allow a reliable determination of the mean valence of Yb ions. For YbAl 2, it is evaluated to be +2.20, which remains nearly unchanged below 300 K. The Kondo resonance peak with an extremely high Kondo temperature (above 2000 K) is clearly identified in the valence-band spectra. The results indicate that a coherent Kondo state can be robust even in a nearly divalent system.

Original languageEnglish
Article number073702
Journaljournal of the physical society of japan
Issue number7
Publication statusPublished - Jul 2012


  • Photoemission spectroscopy
  • Valence fluctuation
  • YbAl

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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