Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-09-06
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, to appear in J. Phys. Soc. Jpn. Suppl
Scientific paper
It has been known that the elemental Yb, a divalent metal at mbient pressure, becomes a mixed-valent metal under external pressure, with its valence reaching ~2.6 at 30 GPa. In this work, infrared spectroscopy has been used to probe the evolution of microscopic electronic states associated with the valence crossover in Yb at external pressures up to 18 GPa. The measured infrared reflectivity spectrum R(w) of Yb has shown large variations with pressure. In particular, R(w) develops a deep minimum in the mid-infrared, which shifts to lower energy with increasing pressure. The dip is attributed to optical absorption due to a conduction c-f electron hybridization state, similarly to those previously observed for heavy fermion compounds. The red shift of the dip indicates that the $c$-$f$ hybridization decreases with pressure, which is consistent with the increase of valence.
Matsunami Masaharu
Nanba Takao
Okamura Hidekzu
Senoo K.
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