Pnicogen-bridged antiferromagnetic superexchange interactions in iron pnictides
文献类型：期刊论文
| 作者 | Lu, ZY ; Ma, FJ ; Xiang, T |
| 刊名 | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
 |
| 出版日期 | 2011 |
| 卷号 | 72期号:5页码:319 |
| 关键词 | SUPERCONDUCTIVITY LAO1-XFXFEAS |
| ISSN号 | 0022-3697 |
| 通讯作者 | Lu, ZY (reprint author), Renmin Univ China, Dept Phys, Beijing 100872, Peoples R China. |
| 中文摘要 | Within a gauge approach to the t-J model, we propose a new, non-BCS mechanism of superconductivity for underdoped cuprates. The gluing force of the superconducting mechanism is an attraction between spin vortices on two different Neel sublattices, centered around the empty sites described in terms of fermionic holons. The spin fluctuations are described by bosonic spinons with a gap generated by the spin vortices. Due to the no-double occupation constraint, there is a gauge attraction between holon and spinon binding them into a physical hole. Through gauge interaction the spin vortex attraction induces the formation of spin-singlet (RVB) spinon pairs with a lowering of the spinon gap. Lowering the temperature, the approach exhibits two crossover temperatures: at the higher crossover a finite density of incoherent holon pairs are formed leading to a reduction of the hole spectral weight, while at the lower crossover a finite density of incoherent spinon RVB pairs are also formed, giving rise to a gas of incoherent preformed hole pairs, and magnetic vortices appear in the plasma phase. Finally, at a even lower temperature the hole pairs become coherent, the magnetic vortices becoming dilute and superconductivity appears. The superconducting mechanism is not of BCS-type since it involves a gain in kinetic energy (for spinons) coming from the spin interactions. (C) 2010 Elsevier Ltd. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/51072]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Lu, ZY,Ma, FJ,Xiang, T. Pnicogen-bridged antiferromagnetic superexchange interactions in iron pnictides[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,2011,72(5):319. |
| APA | Lu, ZY,Ma, FJ,&Xiang, T.(2011).Pnicogen-bridged antiferromagnetic superexchange interactions in iron pnictides.JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,72(5),319. |
| MLA | Lu, ZY,et al."Pnicogen-bridged antiferromagnetic superexchange interactions in iron pnictides".JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 72.5(2011):319. |
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来源：物理研究所
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