TY - JOUR
T1 - Intermediate-valence behavior of YbCu5-xAlx around quantum critical point measured by resonant inelastic X-ray scattering at Yb L3 absorption edge
AU - Yamamoto, Kazuya
AU - Yamaoka, Hitoshi
AU - Tsujii, Naohito
AU - Vlaicu, Aurel Mihai
AU - Oohashi, Hirofumi
AU - Sakakura, Shusuke
AU - Tochio, Tatsuki
AU - Ito, Yoshiaki
AU - Chainani, Ashish
AU - Shin, Shik
PY - 2007/12
Y1 - 2007/12
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=37149014884&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=37149014884&partnerID=8YFLogxK
U2 - 10.1143/JPSJ.76.124705
DO - 10.1143/JPSJ.76.124705
M3 - Article
AN - SCOPUS:37149014884
SN - 0031-9015
VL - 76
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 12
M1 - 124705
ER -