169 citations · 1.2k across the 32 of their papers we have counts for
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Crossover between BCS Superconductor and Doped Mott Insulator of d-wave Pairing State in Two-Dimensional Hubbard Model
Hisatoshi Yokoyama, Masao Ogata, Yukio Tanaka +2
With high-Tc cuprates in mind, properties of correlated dx2-y2-wave superconducting (SC) and antiferromagnetic (AF) states are studied for the Hubbard (t-t'-U) model on square latt…
Unscreening Effect on Fe-Pnictide Superconductor
Yuki Fuseya, Toshikaze Kariyado, Masao Ogata
We study a microscopic mechanism of Fe-pnictide superconductor, considering the screening effects of Coulomb interaction in addition to the conventional spin-fluctuation mechanism.…
Specific Heat and Superfluid Density for Possible Two Different Superconducting States in NaxCoO2.yH2O
Masahito Mochizuki, H. Q. Yuan, Masao Ogata
Several thermodynamic measurements for the cobaltate superconductor, NaxCoO2.yH2O, have so far provided results inconsistent with each other. In order to solve the discrepancies, w…
Deformation of Electronic Structures Due to CoO6 Distortion and Phase Diagrams of NaxCoO2.yH2O
Masahito Mochizuki, Masao Ogata
Motivated by recently reported experimental phase diagrams, we study the effects of CoO6 distortion on the electronic structure in NaxCoO2.yH2O. We construct the multiband tight-bi…
Formation of non-unitary state near the upper-critical field of SrRuO
Masafumi Udagawa, Youichi Yanase, Masao Ogata
We have studied the superconducting state of SrRuO under a magnetic field parallel to the superconducting plane. We show that due to a weak spin-orbit coupling, non-unitary…
Role of spin-orbit coupling on the spin triplet pairing in Na_{x}CoO_{2}yH_{2}O II: Multiple phase diagram under the magnetic field
Youichi Yanase, Masahito Mochizuki, Masao Ogata
The possibility of multiple phase diagram in the novel superconductor Na_{x}CoO_{2}yH_{2}O is analyzed on the basis of the multi-orbital Hubbard model including the atomic spin-orb…