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Autor:
Okamura, H., Kitamura, R., Matsunami, M., Sugawara, H., Harima, H., Sato, H., Moriwaki, T., Ikemoto, Y., Nanba, T.
Publikováno v:
J. Phys. Soc. Jpn. 80 (2011) 084718
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 electronic structures. At ambient pressure, a mid-infrared peak at 0.1 eV was f
Externí odkaz:
http://arxiv.org/abs/1103.0811
Autor:
Maselli, P., Nicoletti, D., Nucara, A., Vitucci, F. M., Irizawa, A., Shoji, K., Nanba, T., Calvani, P.
Publikováno v:
EPL 92, 47001 (2010)
We observe how the charge-ordering (CO) temperature of Nd1/2Sr1/2MnO3 decreases with the external pressure p from 160 K at p = 0 down to 30 K at p ~ 4.5 GPa, by measuring the values p, T where the far-infrared spectral weight of the metallic phase is
Externí odkaz:
http://arxiv.org/abs/1011.0665
Publikováno v:
Phys. Rev. Lett. 103, 237202 (2009)
Optical conductivity [$\sigma(\omega)$] of YbS has been measured under pressure up to 20 GPa. Below 8 GPa, $\sigma(\omega)$ is low since YbS is an insulator with an energy gap between fully occupied 4$f$ state and unoccupied conduction ($c$) band. Ab
Externí odkaz:
http://arxiv.org/abs/0907.4545
Autor:
Matsunami, M., Chainani, A., Taguchi, M., Eguchi, R., Ishida, Y., Takata, Y., Okamura, H., Nanba, T., Yabashi, M., Tamasaku, K., Nishino, Y., Ishikawa, T., Senba, Y., Ohashi, H., Ochiai, A., Shin, S.
Publikováno v:
Phys. Rev. B, 78, 195118 (2008).
Hard x-ray photoemission and optical spectroscopies have been performed on YbS and Yb metal to determine the precise $f$-electron occupation. A comparison of the photoemission spectra with the energy loss functions in bulk and surface, obtained from
Externí odkaz:
http://arxiv.org/abs/0809.4534
Publikováno v:
Phys. Rev. B 75, 041101(R) (2007)
Optical reflectivity R(w) of YbInCu4 single crystals has been measured across its first-order valence transition at T_v ~ 42 K, using both polished and cleaved surfaces. R(w) measured on cleaved surfaces Rc(w) was found much lower than that on polish
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609157
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
Externí odkaz:
http://arxiv.org/abs/cond-mat/0609121
Autor:
Okamura, H., Watanabe, T., Matsunami, M., Nishihara, T., Tsujii, N., Ebihara, T., Sugawara, H., Sato, H., Onuki, Y., Isikakwa, Y., Takabatake, T., Nanba, T.
Publikováno v:
J. Phys. Soc. Jpn. 76 (2007) 023703
Dynamical conductivity spectra s(w) have been measured for a diverse range of heavy-fermion (HF) Ce and Yb compounds. A characteristic excitation peak has been observed in the mid-infrared region of s(w) for all the compounds, and has been analyzed i
Externí odkaz:
http://arxiv.org/abs/cond-mat/0604612
Autor:
Okamura, H., Matsubara, M., Tanaka, K., Fukui, K., Nakagawa, H., Ikemoto, Y., Moriwaki, T., Kimura, H., Nanba, T.
Publikováno v:
J. Phys. Soc. Jpn. 75 (2006) 023703.
Infrared absorption spectra of SrTiO$_3$ have been measured under above-band-gap photoexcitations to study the properties of photogenerated carriers, which should play important roles in previously reported photoinduced phenomena in SrTiO$_3$. A broa
Externí odkaz:
http://arxiv.org/abs/cond-mat/0510827
Autor:
Okamura, H., Matsubara, M., Nanba, T., Tayagaki, T., Mouri, S., Tanaka, K., Ikemoto, Y., Moriwaki, T., Kimura, H., Juhasz, G.
Publikováno v:
Phys. Rev. B 72, 073108 (2005).
Far-infrared spectroscopy has been performed on [Fe(2-picolylamine)3]Cl2EtOH (Fe-pic) single crystals, to probe changes in the molecular vibrations upon the photoinduced and temperature-induced spin crossovers. Synchrotron radiation has been used as
Externí odkaz:
http://arxiv.org/abs/cond-mat/0505336