48 citations · 188 across the 15 of their papers we have counts for
7 papers · 1 filter
Inhomogeneous Electronic Distribution in High-Tc Cuprates
Shigeru Koikegami, Masaru Kato, Takashi Yanagisawa
We theoretically investigate the doping evolution of the electronic state of high-Tc cuprate on both sides of the half-filling on the basis of the three-dimensional three-band Hubb…
Unrestricted Hartree-Fock Analysis of SrCaRuO
Shigeru Koikegami, Takashi Yanagisawa, Soh Koike
We investigated the electronic and magnetic structure of SrCaRuO () on the basis of the double-layered three-dimensional multiband Hubbard mode…
Kink structure in the electronic dispersion of high-Tc superconductors from the electron-phonon interaction
Shigeru Koikegami, Yoshihiro Aiura
We investigate the electronic dispersion of high-Tc superconductor on the basis of the two-dimensional three-band Hubbard model with the electron-phonon interaction together with t…
Metallic State of the Three-band Hubbard Model with Super-lattice Structure
Shigeru Koikegami, Takashi Yanagisawa, Masaru Kato
We investigate the dynamical superlattice correlation in the two-dimensional three-band Hubbard model on the basis of the unrestricted fluctuation exchange approximation. We calcul…
Uniaxial-Pressure induced Ferromagnetism of Enhanced Paramagnetic Sr3Ru2O7
Shin-Ichi Ikeda, Naoki Shirakawa, Takashi Yanagisawa +5
We report a uniaxial pressure-dependence of magnetism in layered perovskite strontium ruthenate Sr3Ru2O7. By applying a relatively small uniaxial pressure, greater than 0.1 GPa nor…
Lattice distortions, incommensurability, and stripes in the electric model for high-Tc cuprates
Takashi Yanagisawa, Mitake Miyazaki, Shigeru Koikegami +2
Striped superconductivity with lattice distortions is investigated based on the three-band Hubbard model for high-Tc cuprates. A stable inhomogeneous striped state is determined in…
Spin Susceptibility and Specific Heat in the d-p Model
Shigeru Koikegami, Kosaku Yamada
We analyze the two-dimensional {\it d-p} model, considering both antiferromagnetic spin fluctuation and -wave superconducting fluctuation. We adopt the fluctuation-exc…