Anomalous electronic Raman scattering in NaxCoO2.yH2O.

Weak Magnetic Order in the Bilayered-hydrate NaxCoO2 · yH2O Structure Probed by Co Nuclear Quadrupole Resonance — Proposed Phase Diagram in Superconducting NaxCoO2 · yH2O —

Possible Pairing Symmetry of Superconductor

To discuss the possibility that the superconductivities in NaxCoO2·yH2O are induced by electron correlation, we investigate the possible pairing symmetry based on the single-band Hubbard model whose dispersion of the bare energy band is obtained using the band structure calculation of NaxCoO2·yH2O. The superconducting transition temperature is estimated by solving the Éliashberg equation. In th...

Possible Pairing Symmetry of Superconductor Na X Coo 2 ·yh 2 O

To discuss a possibility that the superconductivities in NaxCoO2·yH2O are induced by the electron correlation, we investigate the possible pairing symmetry based on the single-band Hubbard model whose dispersion of the bare energy band is obtained by using FLAPW-LDA band structure calculation of NaxCoO2·yH2O. The superconducting transition temperature is estimated by solving the Éliashberg equa...

Possible Pairing Symmetry of Superconductor Na x CoO

To discuss the possibility that the superconductivities in NaxCoO2·yH2O are induced by electron correlation, we investigate the possible pairing symmetry based on the single-band Hubbard model whose dispersion of the bare energy band is obtained using the band structure calculation of NaxCoO2·yH2O. The superconducting transition temperature is estimated by solving the Éliashberg equation. In th...

An Electronic Model for CoO2 layer based systems: Chiral RVB metal and Superconductivity

Takada et al. have reported superconductivity in layered NaxCoO2.yH2O (Tc ≈ 5 K) and more recently Wen et al. in AxCoO2+δ (A = Na, K)(Tc ≈ 31 K). We model a reference neutral CoO2 layer as an orbitally non-degenerate spin1 2 antiferromagnetic Mott insulator on a triangular lattice and NaxCoO2.yH2O and AxCoO2+δ as electron doped Mott insulators described by a tJ model. It is suggested that at op...