An Electronic Model for $Co{O}_2$ layer based systems: Chiral RVB metal and Superconductivity

Abstract

Takada et al. have reported superconductivity in layered $Na__x CoO_2.yH_2O$ ($T_c\approx 5K$) and more recently Wen et al. in $A_{x}Co{O}_{2+\delta }$ ($A=Na,K$)(\tc$\approx 31K$). We model a reference neutral \cob layer as an orbitally non-degenerate spin-\half antiferromagnetic Mott insulator on a triangular lattice and $Na__x CoO_2.yH_2O$ and $A_{x}Co{O}_{2+\delta }$ 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 leads to a d-wave superconducting state. A chiral RVB metal, a PT violating state with condensed RVB gauge fields, with a possible weak ferromagnetism and low temperature p-wave superconductivity are also suggested at higher dopings.

4 pages of LaTex file, 6 figures in eps files. Typos and minor corrections made

References in corpus (1)

• Unconventional magnetic transition and transport behavior in Na0.75CoO2

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