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Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction

文献类型：期刊论文

作者Su, ZB; Yu, L
刊名JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
出版日期2011
卷号72期号:5页码:337-340
关键词T-J MODEL FLUCTUATIONS CROSSOVER
ISSN号0022-3697
通讯作者Marchetti, PA (reprint author), Dipartimento Fis G Galilei, I-35131 Padua, Italy.
英文摘要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.
学科主题Physics
收录类别SCI
原文出处http://dx.doi.org/10.1016/j.jpcs.2010.10.058
语种英语
WOS记录号WOS:000291518100008
公开日期2013-05-17
源URL[http://ir.itp.ac.cn/handle/311006/14360]  
专题理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式
GB/T 7714		 Su, ZB,Yu, L. Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,2011,72(5):337-340.
APA Su, ZB,&Yu, L.(2011).Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction.JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,72(5),337-340.
MLA Su, ZB,et al."Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction".JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS 72.5(2011):337-340.

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来源：理论物理研究所

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