Valence fluctuations in Yb(Al,Fe)B4 studied by nanosecond-time-resolved photoemission spectroscopy using synchrotron radiation

M. Okawa, K. Akikubo, S. Yamamoto, I. Matsuda, T. Saitoh

Research output: Contribution to journalArticlepeer-review


Temporal variations of valence states of the α-YbAl1−xFexB4 crystals (x = 0, 0.013, and 0.098) are experimentally examined in a nanosecond time-scale by time-resolved photoemission experiments using synchrotron radiation. The Yb 4f spectral features show no apparent change with time during relaxations after the optical pumping. The present experimental result indicates that dynamics of valence fluctuations in the material are likely dominated by a picosecond or much faster time-scale. The time-resolved measurement at the time-resolution limit at synchrotron radiation captured the trace of valence fluctuations.

Original languageEnglish
Pages (from-to)20-23
Number of pages4
Journale-Journal of Surface Science and Nanotechnology
Publication statusPublished - 2021 Mar 18
Externally publishedYes


  • Boride
  • Heavy-fermion
  • Time-resolved photoemission spectroscopy
  • YbAlB4

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films


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