Holes in Two-Dimensional CuO<SUB>2</SUB> System —Pairing Mechanism Emerging from Small-Cluster Studies—
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概要
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The strongly correlated two-dimensional CuO<SUB>2</SUB> model is studied to identify the pairing mechanism of holes. Detailed studies of the ground state of clusters up to 30 atoms (10 Cu and 20 O atoms) reveal a binding of two holes doped on oxygen sites for particular values of parameters, which appear relevant to high-<I>T</I><SUB>c</SUB> superconductors. The wave function for the ground state shows that a doped hole on oxygen couples strongly with two neighboring Cu spins, which in turn causes a large magnetic distortion in the surrounding Cu spin system. The interaction between two holes becomes attractive through a constructive interference of the magnetic distortions.
- 社団法人 日本物理学会の論文
著者
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Ogata Masao
Institute For Solid State Physics University Of Tokyo
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Shiba Hiroyuki
Institute For Solic State Physics University Of Tokyo
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