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Koudai Sugimoto,Takami Tohyama,Eiji Kaneshita,Kenji Tsutsui 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
The discovery of iron-pnictide superconductors has enhanced the attraction of the antiferromagneticmetallic phase of multi-orbital systems. We focus on Cr, which is representative antiferromagneticmetal with multi-orbitals like the parent iron-pnictide superconductors. We calculate theband structure and the density of states in commensurate antiferromagnetic Cr by using the spindensitywave for the multi-orbital Hubbard model in the mean-field approximation. The opticalconductivity is calculated by making use of the band structure. A peak structure appears in theantiferromagnetic phase, which is consistent with experimental data. This supports the validity ofour model.
Improved luminescence properties of Na2TiSiO5 phosphor by the Ge4+ doping in the crystal lattice
Young Ji Park,Sun Woog Kim,Kazuma Sugimoto,Takuya Hasegawa,Koudai Tanima,Kazuyoshi Uematsu,Kenji Toda,Mineo Satod 한양대학교 세라믹연구소 2019 Journal of Ceramic Processing Research Vol.20 No.5
Rare earth free white emitting Na2TiSi1−xGexO5 phosphors were synthesized by a conventional solid-state reaction method, and the photoluminescence properties were characterized. The phosphors obtained in the present study showed broad bluish-white emission with a peak at 485 nm due to the charge transfer transition between O2− and Ti4+ and the emission peak intensity was effectively enhanced by the Ge4+ doping in the Na2TiSiO5 crystal lattice. The emission peak intensity of Na2TiSi0.5Ge0.5O5 was 1.35 times higher than that of Na2TiSiO5 and the CIE chromaticity coordinate values for the phosphor were x = 0.29 and y = 0.38.