Deformation of Electronic Structures Due to CoO_6 Distortion and Phase Diagrams of Na_xCoO_2・yH_2O(Condensed matter: electronic structure and electrical, magnetic, and optical properties)
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概要
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Motivated by recently reported experimental phase diagrams, we study the effects of CoO_6 distortion on the electronic structure in Na_xCoO_2・yH_2O. We construct the multiband tight-binding model by employing the LDA result. Analyzing this model, we show the deformation of band dispersions and Fermi-surface topology as functions of CoO_2-layer thickness. Considering these results together with previous theoretical ones, we propose a possible schematic phase diagram with three successive phases: the extended s-wave superconductivity (SC), the magnetic order, and the spin-triplet SC phases when the Co valence number s is +3.4. A phase diagram with only one phase of spin-triplet SC is also proposed for the s=+3.5 case.
- 社団法人日本物理学会の論文
- 2006-11-15
著者
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OGATA Masao
Department of Physics, University of Tokyo
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MOCHIZUKI Masahito
RIKEN
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Sciences The University Of Tokyo
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Ogata Masao
Department Of Basic Science Graduate School Of Arts And Science University Of Tokyo
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