Superconductivity in Na${}_x$CoO${}_2\cdot y$H${}_2$O driven by the kinetic energy

Abstract

Within the charge-spin separation fermion-spin theory, the mechanism of superconductivity in Na${}_x$CoO${}_2\cdot y$H${}_2$O 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 $\delta \approx 0.29$, and then decreases for both underdoped and overdoped regimes, in qualitative agreement with the experimental results.

3 pages, one figure is included

References in corpus (4)

• An Electronic Model for $Co{O}_2$ layer based systems: Chiral RVB metal and Superconductivity
• A gauge invariant dressed holon and spinon description of the normal-state of underdoped cuprates
• Kinetic energy driven superconductivity in doped cuprates
• Charge transport of electron doped Mott insulators on a triangular lattice

Cited by in corpus (3)

• Dynamical spin response of electron doped Mott insulators on a triangular lattice
• Superconductivity and magnetic fluctuations in electron-doped cobaltate superconductors
• Heat transport of electron-doped Cobaltates