Two-Band Model for High Tc Superconductivity |
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Authors: | YANG Zhen-qing KONG Fan-mei |
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Affiliation: | Department of Physics, Nankai University, Tianjin 300071, China |
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Abstract: | A two-band model is dealt with by the canonical perturbation theory of projection operators. An effective Hamiltonian with Cu-Cu, Cu-O and O-O couplings is obtained. A unified treatment for such a coupled system gives the variations of transition temperatures for Cu-Cu, Cu-O and O-O parings with the concentration of O-holes. A window of δ for superconductivity is obtaihed and compared with experimental data qualitatively and quantitatively. |
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