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SUPERCONDUCTIVITY IN <font>Na</font><sub>x</sub><font>CoO</font><sub>2</sub>·y<font>H</font><sub>2</sub><font>O</font> DRIVEN BY THE KINETIC ENERGY
Within the charge-spin separation fermion-spin theory, the mechanism of superconductivity in Na x CoO 2 ·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 …