Speaker
Masaharu Matsunami
(UVSOR Facility, Institute for Molecular Science)
Description
Masaharu Matsunami, UVSOR Facility
Tetsuya Hajiri, UVSOR Facility
Hidetoshi Miyazaki, UVSOR Facility
Masashi Kosaka, Saitama University
Shin-ichi Kimura, UVSOR Facility
Heavy-fermion or valence-fluctuation phenomena in strongly-correlated f-electron systems can be derived from the hybridization between conduction band and 4f states (c-f hybridization). Therefore, to directly probe the c-f hybridized electronic structures in the momentum space is important for understanding the heavy-fermion physics. Angle-resolved photoemission spectroscopy (ARPES) is a powerful tool for this purpose.
In this work, we have performed ARPES for Yb-based compounds such as YbAl2, a prototypical valence fluctuation system, to observe the energy-momentum dispersion curves in the three-dimensional momentum space using a synchrotron radiation.
For YbAl2, the c-f hybridized bands and the dispersive Kondo resonance peak have been clearly observed in the APRES spectra. The results are closely associated with the extremely high Kondo temperature (>2000 K).
On the basis of these findings, the c-f hybridized electronic structures in Yb compounds will be discussed in comparison with theoretical models such as LDA band calculations and periodic Anderson model.
Primary author
Masaharu Matsunami
(UVSOR Facility, Institute for Molecular Science)
