Výsledky vyhledávání - "Takegahara K"

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Electronic structure of Mott-insulator CaCu3Ti4O12: Photoemission and inverse photoemission study

Autor: Im, H. J., Iwataki, M., Yamazaki, S., Usui, T., Adachi, S., Tsunekawa, M., Watanabe, T., Takegahara, K., Kimura, S., Matsunami, M., Sato, H., Namatame, H., Taniguchi, M.

Publikováno v: Solid State Commun. 217, 17 (2015)

We have performed the photoemission and inverse photoemission experiments to elucidate the origin of Mott insulating states in A-site ordered perovskite CaCu$_3$Ti$_4$O$_{12}$ (CCTO). Experimental results have revealed that Cu 3$d$-O 2$p$ hybridized

Externí odkaz: http://arxiv.org/abs/1504.03798

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Strong Correlation Effects of A-site Ordered Perovskite CaCu3Ti4O12 revealed by Angle-Resolved Photoemission Spectroscopy

Autor: Im, H. J., Tsunekawa, M., Sakurada, T., Iwataki, M., Kawata, K., Watanabe, T., Takegahara, K., Miyazaki, H., Matsunami, M., Hajiri, T., Kimura, S.

Publikováno v: Phys. Rev. B 88, 205133 (2013)

We report angle-resolved photoemission spectroscopy (ARPES) results of A-site ordered perovskite CaCu$_3$Ti$_4$O$_{12}$. We have observed the clear band dispersions, which are shifted to the higher energy by 1.7 eV and show the band narrowing around

Externí odkaz: http://arxiv.org/abs/1303.4502

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Theory of Metal-Insulator Transition in PrRu4P12 and PrFe4P12

Autor: Curnoe, S. H., Harima, H., Takegahara, K., Ueda, K.

Publikováno v: Phys. Rev. B 70, 245112 (2004)

All symmetry allowed couplings between the 4f^2-electron ground state doublet of trivalent praseodymium in PrRu4P12 and PrFe4P12 and displacements of the phosphorus, iron or ruthenium ions are considered. Two types of displacements can change the cry

Externí odkaz: http://arxiv.org/abs/cond-mat/0405127

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Mutual Experimental and Theoretical Validation of Bulk Photoemission Spectra of Sr1-xCaxVO3

Autor: Sekiyama, A., Fujiwara, H., Imada, S., Suga, S., Eisaki, H., Uchida, S. I., Takegahara, K., Harima, H., Saitoh, Y., Nekrasov, I. A., Keller, G., Kondakov, D. E., Kozhevnikov, A. V., Pruschke, Th., Held, K., Vollhardt, D., Anishimov, V. I.

Publikováno v: Physical Review Letters 93, 156402 (2004).

We report high-resolution high-energy photoemission spectra together with parameter-free LDA+DMFT (local density approximation + dynamical mean-field theory) results for Sr1-xCaxVO3, a prototype 3d1 system. In contrast to earlier investigations the b

Externí odkaz: http://arxiv.org/abs/cond-mat/0312429

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Genuine Electronic States of Vanadium Perovskites Revealed by High-Energy Photoemission

Autor: Sekiyama, A., Fujiwara, H., Imada, S., Eisaki, H., Uchida, S. I., Takegahara, K., Harima, H., Saitoh, Y., Suga, S.

Bulk-sensitive high-resolution photoemission was carried out on a prototype 3d1 metallic Sr1-xCaxVO3. In a strong contrast to so far reported results, the bulk spectral functions are revealed to be insensitive to x. The conservation of the density of

Externí odkaz: http://arxiv.org/abs/cond-mat/0206471

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