Electronic Model for CoO2 Layer Based Systems: Chiral Resonating Valence Bond Metal and Superconductivity
G. Baskaran
DOI 10.1103/PhysRevLett.91.097003 · Physical Review Letters
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Abstract
Takada et al. have reported superconductivity in layered NaxCoO2yH2O (Tc≈5 K). We model a reference neutral CoO2 layer as an orbitally nondegenerate spin-12 antiferromagnetic Mott insulator on a triangular lattice and NaxCoO2yH2O as electron doped Mott insulators described by a t−J model. It is suggested that at optimal doping chiral spin fluctuations enhanced by the dopant dynamics lead to a gapful d-wave superconducting state. A chiral resonating valence bond (RVB) metal, a parity and time (PT) reversal violating state with condensed RVB gauge fields, with a possible weak ferromagnetism, and low temperature p-wave superconductivity are also suggested at higher dopings.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| NaxCoO2yH2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
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