Spin Fluctuations and Superconductivity in Two-Dimensional CuO_2 System
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概要
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The dp model of the two-dimensional Cub. system is investigated for its supercon-ductivity and normal state properties. The normal and snomalous self-energy parts ofelectrons are determined self-consistently through the RPA for the exchange of spinfluctuations. We determine both parts without assuming their momentumdependences. The normal self-energy part is approximated by a linear function of thefrequency variable. Quantities derived from one-body Green functions are presentedin several ratios of the on-site repulsion U at copper d orbital to the energy differenceA between copper d and oxygen p orbitals. Neighboring to the antiferromagneticstate, d-wave superconductivity takes place. Momentum dependences of the normaland anomalous self-energy parts on the copper site are similar to those in the single-band llubbard model.
- 社団法人日本物理学会の論文
- 1990-06-15
著者
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YONEMITSU Kenji
Department of Physics,University of Tokyo
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Yonemitsu Kenji
Department Of Physics University Of Tokyo
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