| 非含Cu氧化物超导体的超导电性机制 |
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| 引用本文： | 余超凡,陈斌,何国柱.非含Cu氧化物超导体的超导电性机制[J].物理学报,1994,43(7):1152-1158. |
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| 作者姓名： | 余超凡 陈斌 何国柱 |
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| 作者单位： | (1)南开大学物理系; (2)南开大学物理系,广东教育学院物理系; (3)南开数学研究所理论物理部 |
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| 基金项目： | 国家自然科学基金资助的课题. |
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| 摘 要： | 基于单占据ａｉσ表象和电荷涨落机制，应用简并微扰理论推导了非含ｃｕ氧化物Ｂａ1-x·ＫxＢｉＯ3的双带Ｈｕｂｂａｒｄ模型有效哈密顿量．考虑到坐标空间两个相反自旋空穴的次近邻格位配对，得到了格林函数运动方程和超导方程．合理解释了超交换作用和跳跃能对次近邻配对的作用，并且超导窗是由于坐标空间Ｃｏｏｐｅｒ配对的结果．
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| 关 键 词： | 氧化物超导体 超导性 不含铜 |
| 收稿时间： | 6/3/1993 12:00:00 AM |
SUPERCONDUCTIVITY MECHANISM OF NON-CUPRATE SUPERCONDUCTORS |
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| YU CHAO-FAN,CHEN BIN and HE GUO-ZHU.SUPERCONDUCTIVITY MECHANISM OF NON-CUPRATE SUPERCONDUCTORS[J].Acta Physica Sinica,1994,43(7):1152-1158. |
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| Authors: | YU CHAO-FAN CHEN BIN and HE GUO-ZHU |
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| Abstract: | Based on the singly occupied a-picture and the mechanism of charge fluctuation, the effective Hamiltonian of two-band Hubbard model is derived by using the degeneracy perturbation theory for the non-cuprate comoound Ｂａ1-xＫxＢｉＯ3. By considering the next neighbour pairing of two opposite spin holes in coordinate space, the Green's function equation of motion and superconductivity equation are obtained. Furthermore, how the superexchange interaction and the hopping energy affect the next neighbour pairing has been explained reasonably, and the superconductivity window is due to the Cooper pairing in coordinate space. |
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