75 citations · 252 across the 8 of their papers we have counts for
8 papers
Theoretical study of spin-fluctuation-mediated superconductivity in two-dimensional Hubbard models with an incipient flat band
Tetsuaki Aida, Karin Matsumoto, Daisuke Ogura +2
One promising way to enhance superconductivity is to have coexisting wide and incipient narrow bands, where the Fermi level intersecting the wide band lies just above the narrow ba…
Superconducting mechanism for the cuprate BaCuO based on a multiorbital Lieb lattice model
Kimihiro Yamazaki, Masayuki Ochi, Daisuke Ogura +4
For the recently discovered cuprate superconductor , we propose a lattice structure which resembles the model considered by Lieb to represent the vastly o…
Strongly enhanced superconductivity due to finite energy spin fluctuations induced by an incipient band : a FLEX study on the bilayer Hubbard model with vertical and diagonal interlayer hoppings
Karin Matsumoto, Daisuke Ogura, Kazuhiko Kuroki
We study the spin-fluctuation-mediated -wave superconductivity in the bilayer Hubbard model with vertical and diagonal interlayer hoppings. As in the two-leg ladder model wit…
Hidden kagome-lattice picture and origin of high conductivity in delafossite PtCoO
Hidetomo Usui, Masayuki Ochi, Sota Kitamura +8
We study the electronic structure of delafossite PtCoO to elucidate its extremely small resistivity and high mobility. The band exhibits steep dispersion near the Fermi level d…
Wide applicability of high pairing originating from coexisting wide and incipient narrow bands in quasi one dimension
Karin Matsumoto, Daisuke Ogura, Kazuhiko Kuroki
We study superconductivity in the Hubbard model on various quasi-one-dimensional lattices with coexisting wide and narrow bands originating from multiple sites within a unit cell,…
Possible high- superconductivity due to incipient narrow bands originating from hidden ladders in Ruddlesden-Popper compounds
Daisuke Ogura, Hideo Aoki, Kazuhiko Kuroki
We introduce a concept of hidden ladders for the bilayer Ruddlesden-Popper type compounds: While the crystal structure is bilayer, () orbitals in the relevant $t_{…
Finite energy spin fluctuation as a pairing glue in systems with coexisting electron and hole bands
Masahiro Nakata, Daisuke Ogura, Hidetomo Usui +1
We study, within the fluctuation exchange approximation, the spin-fluctuation-mediated superconductivity in Hubbard-type models possessing electron and hole bands, and compare them…
Asymmetry of Superconductivity in Hole- and Electron-doped Cuprates: Explanation within Two-Particle Self-Consistent Analysis for the Three-Band Model
Daisuke Ogura, Kazuhiko Kuroki
In the hole-doped cuprate superconductors, the superconducting transition temperature exhibits a dome-like feature against the doping rate. By contrast, recent experiments re…