93 citations · 298 across the 8 of their papers we have counts for
8 papers
Charge order and superconductivity in a two-dimensional triangular lattice at n=2/3
Hiroshi Watanabe, Masao Ogata
To investigate the possibility of charge order and superconductivity in a doped two-dimensional triangular lattice, we study the extended Hubbard model with variational Monte Carlo…
Ferromagnetic fluctuation and superconductivity in Na_0.35CoO_2*1.3H_2O: FLEX study of multi-orbital Hubbard model
Masahito Mochizuki, Youichi Yanase, Masao Ogata
Spin and charge fluctuations and superconductivity in Na_0.35CoO_2*1.3H_2O are studied based on a multi-orbital Hubbard model. By applying the fluctuation exchange (FLEX) approxima…
Ferromagnetic and triplet-pairing instabilities controlled by the trigonal distortion of the CoO_6 octahedra in Na_xCoO_2*yH_2O
Masahito Mochizuki, Youichi Yanase, Masao Ogata
In the recently discovered Co-oxide superconductor Na_xCoO_2*yH_2O, the edge-shared CoO6 octahedra are trigonally contracted along the c-axis in the CoO2-plane. We study how this C…
Quantum Melting of Charge Order due to Frustration in Two-Dimensional Quarter-Filled Systems
Jaime Merino, Hitoshi Seo, Masao Ogata
The effect of geometrical frustration in a two-dimensional 1/4-filled strongly correlated electron system is studied theoretically, motivated by layered organic molecular crystals.…
Ferromagnetic fluctuation and possible triplet superconductivity in Na_xCoO_2*yH_2O: Fluctuation-exchange study of multi-orbital Hubbard model
Masahito Mochizuki, Youichi Yanase, Masao Ogata
Spin and charge fluctuations and superconductivity in a recently discovered superconductor Na_xCoO_2*yH_2O are studied based on a multi-orbital Hubbard model. Tight-binding paramet…
Unconventional superconductivity in NaCoO1.3DO and proximity to a magnetically ordered phase
Y. J. Uemura, P. L. Russo, A. T. Savici +8
Muon spin relaxation (SR) measurements on the new layered cobalt oxide superconductor NaCoO1.3HO and its parent, non-superconducting compounds, have re…