| Original Articles |
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Electron Spin Pairing and the Phase Diagram of High-Tc Superconductors |
| GUO Wei;HAN Ru-Shan |
| Department of Physics, Peking University, Beijing 100871 |
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| Cite this article: |
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GUO Wei, HAN Ru-Shan 2001 Chin. Phys. Lett. 18 1398-1400 |
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Abstract The origin of the instability of the normal state of electrons in the superconducting copper oxides is shown by the K-J model, in which the superexchange (K) between local moments and the Kondo exchange (J) between electron and local moment are considered. The suppression of superexchange via impurity doping may induce effective spin coupling between electrons and triplet pairing ( S = 1, Sz = 0 ). The spin pairing theory explains the phase diagram of the high-Tc superconductors, especially the superconducting transition temperature Tc, the pseudogap temperature T* and the magnetic crossover temperature Tn as a function of the doped hole concentration. The universal expression for the empirical law of the superconducting transition temperature is derived from the theory.
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| Keywords:
74.20.Mn
74.25.Dw
75.30.Et
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Published: 01 October 2001
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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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