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Motivated by recently reported experimental phase diagrams, we study theeffects of CoO6 distortion on the electronic structure in NaxCoO2.yH2O. Weconstruct the multiband tight-binding model by employing the LDA result.Analyzing this model, we show the deformation of band dispersions andFermi-surface topology as functions of CoO2-layer thickness. Considering theseresults together with previous theoretical ones, we propose a possibleschematic phase diagram with three successive phases: the extended s-wavesuperconductivity (SC), the magnetic order, and the spin-triplet SC phases whenthe Co valence number s is +3.4. A phase diagram with only one phase ofspin-triplet SC is also proposed for the s=+3.5 case.Comment: 4 pages, 5 figure

journal of the physical society of japan

Deformation of Electronic Structures Due to CoO6 Distortion and Phase Diagrams of NaxCoO2·yH2O