| Original Articles |
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Electron Spin Pairing and Excitations in High-Tc
Superconductors |
| GUO Wei;HAN Ru-Shan;ZHENG Yi |
| State Key Laboratory for Mesoscopic Physics and School of Physics, Peking University, Beijing 100871 |
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| Cite this article: |
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GUO Wei, HAN Ru-Shan, ZHENG Yi 2002 Chin. Phys. Lett. 19 1687-1690 |
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Abstract Effective spin coupling between conduction electrons mediated by local Cu moments in the doped CuO2 plane may induce the instability of the normal states of conduction electrons and pairing at Cu sites, where the superexchange interaction between local moments influenced by hole doping is found to be Ising-like in recent experiments. By a mean field approach, we show that spin pairing and strong pair-pair interaction in the doped antiferromagnetic ordered Ising-like CuO2 plane gives rise to high temperature superfluid condensation and the exceptional features of quasi-particle excitation in cuprates such as spin gap, pseudogap, and the linear temperature dependence of resistivity ρab in the normal states.
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| Keywords:
74.20.Mn
74.25.Dw
75.30.Et
75.50.Ee
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Published: 01 November 2002
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| PACS: |
74.20.Mn
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(Nonconventional mechanisms)
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74.25.Dw
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(Superconductivity phase diagrams)
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75.30.Et
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(Exchange and superexchange interactions)
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75.50.Ee
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(Antiferromagnetics)
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