Hidekazu Okamura

Optical conductivity of the Kondo insulator YbB12 : Gap formation and low-energy excitations

Optical reflectivity experiments have been conducted on single crystals of the Kondo insulator

Reconstruction of BL7B for UV, VIS and IR spectroscopy with a 3 m normal-incidence monochromator

{\mathrm{YbB}}_{12}

Pseudogap Formation and Heavy-Carrier Dynamics in Intermediate-Valence YbAl3

in order to obtain its optical conductivity, \ensuremath{\sigma}(\ensuremath{\omega}). Upon cooling below 70 K, a strong suppression of \ensuremath{\sigma}(\ensuremath{\omega}) is seen in the far-infrared region, indicating the opening of an energy gap of

Gap Formation in the Filled Skutterudite CeOs4Sb12

\ensuremath{\sim}25\mathrm{meV}.

Pressure tuning of an ionic insulator into a heavy electron metal: an infrared study of YbS.

This gap development is coincident with a rapid decrease in the magnetic susceptibility, which shows that the gap opening has significant influence on magnetic properties. A narrow, asymmetric peak is observed at

Photogenerated Carriers in SrTiO3 Probed by Mid-Infrared Absorption

\ensuremath{\sim}40\mathrm{meV}

Charge dynamics in the colossal magnetoresistance pyrochlore Tl 2 Mn 2 O 7

in \ensuremath{\sigma}(\ensuremath{\omega}), which is attributed to optical transitions between the Yb

Indirect and Direct Energy Gaps in Kondo Semiconductor YbB12

4f

New Infrared and Terahertz Beam Line BL6B at UVSOR

-derived states across the gap. In addition, a broad peak is observed at

Infrared study of spin crossover Fe-picolylamine complex

\ensuremath{\sim}0.25\mathrm{eV}.