7 papers
Pressure suppression of unconventional charge-density-wave state in PrRu4P12 studied by optical conductivity
H. Okamura, N. Ohta, A. Takigawa +12
Optical conductivity s(w) of PrRu4P12 has been studied under high pressure to 14 GPa, at low temperatures to 8 K, and at photon energies 12 meV-1.1 eV. The energy gap in s(w) at am…
Optical Conductivity and Electronic Structure of CeRu4Sb12 under High Pressure
H. Okamura, R. Kitamura, M. Matsunami +6
Optical conductivity [s(w)] of Ce-filled skutterudite CeRu4Sb12 has been measured at high pressure to 8 GPa and at low temperature, to probe the pressure evolution of its electroni…
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…
Pressure-tuning of the c-f hybridization in Yb metal detected by infrared spectroscopy up to 18 GPa
H. Okamura, K. Senoo, M. Matsunami +1
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 thi…
Possible Kondo resonance in PrFe4P12 studied by bulk-sensitive photoemission
A. Yamasaki, S. Imada, T. Nanba +7
Pr 4f electronic states in Pr-based filled skutterudites PrT4X12(T=Fe and Ru; X=P and Sb) have been studied by high-resolution bulk-sensitive Pr 3d-4f resonance photoemission. A ve…
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…