| gossamer超导体基态相图的研究 |
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| 引用本文： | 刘芬芬,袁峰,邱环环,夏临华.gossamer超导体基态相图的研究[J].青岛大学学报(自然科学版),2008,21(1):53-57. |
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| 作者姓名： | 刘芬芬 袁峰 邱环环 夏临华 |
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| 作者单位： | 青岛大学物理科学学院,山东,青岛,266071 |
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| 摘 要： | 在t-t’-J-U模型下，应用Gutzwiller平均场近似的方法，研究了gossamer超导体基态情况下的相图。结果表明，大U极限下，在欠掺杂区域，反铁磁序和d波超导序在很大的掺杂浓度范围内都共存。随着次近邻跃迁的增大，超导序参数在欠掺杂区域受到抑制，在最佳掺杂和过掺杂区域得到加强，从而导致反铁磁序和d波超导序共存区域变大，d波超导序在较大的掺杂浓度范围内一直存在。这些都与数值计算结果的趋势一致。
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| 关 键 词： | gossamer超导体 Gutzwiller平均场近似 d波超导序 反铁磁序 |
| 文章编号： | 1006-1037(2008)01-0053-04 |
| 修稿时间： | 2007年12月26 |
Phase Diagram of Gossamer Superconductors in t t-t'-J-U Model |
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| LIU Fen-fen,YUAN Feng,QIU Huan-huan,XIA Lin-hua.Phase Diagram of Gossamer Superconductors in t t-t'-J-U Model[J].Journal of Qingdao University(Natural Science Edition),2008,21(1):53-57. |
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| Authors: | LIU Fen-fen YUAN Feng QIU Huan-huan XIA Lin-hua |
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| Institution: | (College of Physics Science, Qingdao University, Qingdao 266071, China) |
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| Abstract: | The phase diagrams of gossamer superconductors are studied in a renormalized mean-field theory based on the Gutzwiller approximation within the t-t＇-J-U model. In the large-U limit, The results show that the antiferromagnetic （AF） order coexists with the d-wave superconductivity （dSC） in the underdoped region around the doping δ≈0. 1. The dSC order parameter is slightly suppressed in the underdoped regions, and greatly enhanced in the optimal and overdoped regions with the increasing of the t＇. As a result, the coexistence region of the AF and dSC is extended to higher doping and the dSC order persists for a larger doping. |
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| Keywords: | gossamer superconductor Gutzwiller mean field approximation d-wave superconductivity order antiferromagnetic order |
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