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cond-mat.str-el2009
Pressure Tuning of an Ionic Insulator into a Heavy Electron Metal: An Infrared Study of YbS
M. Matsunami, H. Okamura, A. Ochiai +1
Optical conductivity [] of YbS has been measured under pressure up to 20 GPa. Below 8 GPa, is low since YbS is an insulator with an energy gap between fully occupied 4…
cond-mat.str-el2001
Charge Dynamics in the Colossal Magneto-Resistance Pyrochlore Tl2Mn2O7
H. Okamura, T. Koretsune, M. Matsunami +5
Optical conductivity data s(w) of the colossal magneto-resistance (CMR) pyrochlore Tl2Mn2O7 are presented as functions of temperature (T) and externalmagnetic field (B). Upon cooli…
cond-mat.str-el1998
Optical conductivity of the Kondo insulator YbB_12: Gap formation and low-energy excitations
H. Okamura, S. Kimura, H. Shinozaki +4
Optical reflectivity experiments have been conducted on single crystals of the Kondo insulator YbB_12 in order to obtain its optical conductivity, σ(ω). Upon cooling below 70 K, a…