International Journal of Modern Physics B c ○ World Scientific Publishing Company Superconductivity in NaxCoO2 · yH2O driven by the kinetic energy
نویسندگان
چکیده
Within the charge-spin separation fermion-spin theory, the mechanism of superconductivity in NaxCoO2 ·yH2O is studied. It is shown that dressed fermions interact occurring directly through the kinetic energy by exchanging magnetic excitations. This interaction leads to a net attractive force between dressed fermions(then the electron Cooper pairs), and their condensation reveals the superconducting ground state. The optimal superconducting transition temperature occurs in the electron doping concentration δ ≈ 0.29, and then decreases for both underdoped and overdoped regimes, in qualitative agreement with the experimental results.
منابع مشابه
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...
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