Intermediate-valence behavior of YbCu5-xAlx around quantum critical point measured by resonant inelastic X-ray scattering at Yb L3 absorption edge

Kazuya Yamamoto, Hitoshi Yamaoka, Naohito Tsujii, Aurel Mihai Vlaicu, Hirofumi Oohashi, Shusuke Sakakura, Tatsuki Tochio, Yoshiaki Ito, Ashish Chainani, Shik Shin

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)


An x-ray spectroscopy study was performed for YbCu5-xAl x (x = 0.0-2.0) using high-resolution partial-fluorescence yield (PFY) and resonant inelastic x-ray scattering (RIXS) at the Yb L3 absorption edge. From a careful analysis of the PFY and RIXS spectra, the mean-valence of Yb was estimated and is found to increase quite rapidly for compositions between 0 ≤ x ≤ 1.0, indicating strong intermediate-valence behavior. The mean valence continues to increase gradually with x and becomes nearly trivalent for x = 2.0. Our results, however, reveal that valence fluctuation occurs even at x = 1.5, for which non-Fermi liquid quantum critical behavior is known. The valence evolution cannot be explained solely in terms of chemical pressure effects. The study suggests the role of valence-coupled spin fluctuations for the quantum critical behavior.

Original languageEnglish
Article number124705
JournalJournal of the Physical Society of Japan
Issue number12
Publication statusPublished - 2007 Dec 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


Dive into the research topics of 'Intermediate-valence behavior of YbCu<sub>5-x</sub>Al<sub>x</sub> around quantum critical point measured by resonant inelastic X-ray scattering at Yb L<sub>3</sub> absorption edge'. Together they form a unique fingerprint.

Cite this