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Sugimoto, Kodai*; Toyama, Takami*; Kaneshita, Eiji*; Tsutsui, Kenji
Journal of the Korean Physical Society, 63(3), p.632 - 635, 2013/08
Times Cited Count：0 Percentile：0.00(Physics, Multidisciplinary)Cr is the representative material of multi-orbital antiferromagnetism. We numerically calculate the band structure and density of states in commensurate antiferromagnetic Cr by multi-orbital Hubbard model with mean-field approximation. The result is adopted to the calculation of optical conductivity. The spectra of the optical conductivity is consistent with experimental data, and this promises the validity of our model.
Sugimoto, Kodai*; Li, Z.*; Kaneshita, Eiji*; Tsutsui, Kenji; Toyama, Takami*
Physical Review B, 87(13), p.134418_1 - 134418_8, 2013/04
Times Cited Count：7 Percentile：32.24(Materials Science, Multidisciplinary)We theoretically investigate spin dynamics and L-edge resonant inelastic X-ray scattering (RIXS) of chromiumwith commensurate spin-density wave (SDW) order, based on a multiband Hubbard model. Obtaining the ground state with the SDW mean-field approximation, we calculate the dynamical spin susceptibility by using random-phase approximation. We find that a collectivespin-wave excitation hardly damps up to 0.6 eV. Above the energy, the excitation overlaps individual particle-hole excitations, leading to broad spectral weight.
Sugimoto, Kodai*; Kaneshita, Eiji*; Tsutsui, Kenji; Toyama, Takami*
no journal, ,
Chromium is representative material of multi-orbital anriferromagnetism. We calculate the electronic state by multi-orbital Hubbard model with mean-field approximation. Using the states, we also calculate the L-edge resonant inelastic X-ray scattering spectra with first-collision approximation. We discuss characteristic spectral features.
Sugimoto, Kodai*; Zhi, L.*; Kaneshita, Eiji*; Tsutsui, Kenji; Toyama, Takami*
no journal, ,
Chromium is a representative metal with spin density wave. In this study, spin excitation and L-edge resonant inelastic X-ray scattering spectra are obtained theoretically by using the multi-orbital Hubbard model with mean-field, randam phase, and first collision approximations.
