Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2009-06-26
Phys. Rev. Lett. 104, 247201 (2010)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 3 figures, revised version accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.104.247201
Electronic structures of the quantum critical superconductor beta-YbAlB4 and its polymorph alpha-YbAlB4 are investigated by using bulk-sensitive hard x-ray photoemission spectroscopy. From the Yb 3d core level spectra, the values of the Yb valence are estimated to be ~2.73 and ~2.75 for alpha- and beta-YbAlB4, respectively, thus providing clear evidence for valence fluctuations. The valence band spectra of these compounds also show Yb2+ peaks at the Fermi level. These observations establish an unambiguous case of a strong mixed valence at quantum criticality for the first time among heavy fermion systems, calling for a novel scheme for a quantum critical model beyond the conventional Doniach picture in beta-YbAlB4.
Chainani Ashish
Eguchi R.
Horie Naoki
Ishikawa Tadashi
Ishizaka Kazuya
No associations
LandOfFree
Strong valence fluctuation in the quantum critical heavy fermion superconductor beta-YbAlB4: A hard x-ray photoemission study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Strong valence fluctuation in the quantum critical heavy fermion superconductor beta-YbAlB4: A hard x-ray photoemission study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Strong valence fluctuation in the quantum critical heavy fermion superconductor beta-YbAlB4: A hard x-ray photoemission study will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-670739