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Within the charge-spin separation fermion-spin theory, the mechanism ofsuperconductivity in Na$_{x}$CoO$_{2}\cdot y$H$_{2}$O is studied. It is shownthat dressed fermions interact occurring directly through the kinetic energy byexchanging magnetic excitations. This interaction leads to a net attractiveforce between dressed fermions(then the electron Cooper pairs), and theircondensation reveals the superconducting ground state. The optimalsuperconducting transition temperature occurs in the electron dopingconcentration $\delta\approx 0.29$, and then decreases for both underdoped andoverdoped regimes, in qualitative agreement with the experimental results.Comment: 3 pages, one figure is include

SUPERCONDUCTIVITY IN NaxCoO2·yH2O DRIVEN BY THE KINETIC ENERGY

SUPERCONDUCTIVITY IN Na_xCoO₂·yH₂O DRIVEN BY THE KINETIC ENERGY