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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 theevolution of microscopic electronic states associated with the valencecrossover in Yb at external pressures up to 18 GPa. The measured infraredreflectivity spectrum R(w) of Yb has shown large variations with pressure. Inparticular, R(w) develops a deep minimum in the mid-infrared, which shifts tolower energy with increasing pressure. The dip is attributed to opticalabsorption due to a conduction c-f electron hybridization state, similarly tothose previously observed for heavy fermion compounds. The red shift of the dipindicates that the $c$-$f$ hybridization decreases with pressure, which isconsistent with the increase of valence.Comment: 2 pages, to appear in J. Phys. Soc. Jpn. Supp

Pressure-Tuning of thec–fHybridization in Yb Metal Detected by Infrared Spectroscopy up to 18 GPa