Electronic Model forCoO2Layer Based Systems: Chiral Resonating Valence Bond Metal and Superconductivity

2003/03/31 by G. Baskaran · 15 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1103/physrevlett.91.097003

published as Physical Review Letters, 91, 097003 (2003) · 4 pages of LaTex file, 6 figures in eps files. Typos and minor corrections made

arxiv created 2003/04/01 · openalex publication_date 2003/08/27 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

Takada et al. have reported superconductivity in layered Na_xCoO₂yH₂O (T_c\ensuremath≈5 K). We model a reference neutral CoO₂ layer as an orbitally nondegenerate spin-(1)/(2) antiferromagnetic Mott insulator on a triangular lattice and Na_xCoO₂yH₂O as electron doped Mott insulators described by a t\ensuremath-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.

Citations

• Equivalence of the resonating-valence-bond and fractional quantum Hall states

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