12 citations · 15 across the 4 of their papers we have counts for
7 papers
A Microscopic Theory of Odd-freqeuncy Pairing in the Two-dimensional Extended Hubbard Model
Keiji Yada, Seiichiro Onari, Yukio Tanaka +1
We present a microscopic theory of fluctuation-mediated pairing mechanism in a two-dimensional extended Hubbard model. In contrast to conventional wisdom, odd-frequency spin-triple…
s-wave Superconductivity due to Suhl-Kondo Mechanism in NaCoOHO: Effect of Coulomb Interaction and Trigonal Distortion
Keiji Yada, Hiroshi Kontani
To study the electron-phonon mechanism of superconductivity in NaxCoO2, we perform semiquantitative analysis of the electron-phonon interaction (EPI) between relevant optical phono…
Renormalization of Coulomb interactions in s-wave superconductor NaCoO
Keiji Yada, Hiroshi Kontani
We study the renormalized Coulomb interactions due to retardation effect in NaCoO. Although the Morel-Anderson's pseudo potential for orbital is relati…
Robustness of s-wave superconductivity against Coulomb interactions in NaCoO
Keiji Yada, Hiroshi Kontani
We study the depairing effect due to Coulomb interactions in NaCoO. We consider the electron-phonon coupling and the Coulomb interactions, and determine for s-wave su…
Electron-Phonon mechanism for Superconductivity in NaCoO: Valence-Band Suhl-Kondo effect Driven by Shear Phonons
Keiji Yada, Hiroshi Kontani
To study the possible mechanism of superconductivity in NaCoO, we examine the interaction between all the relevant optical phonons (breathing and shear phonons) and $t…
Spin fluctuations and weak pseudogap behaviors in Na_{0.35}CoO_2:renomarization of band structure
Keiji Yada, Hiroshi Kontani
We analyze the normal electronic states of NaCoO based on the multi-orbital Hubbard model using the FLEX approximation. The fundamental electronic property of this sys…