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题名: Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction
作者: Marchetti, PA ;  Ye, F ;  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
学科分类: Physics
通讯作者: Marchetti, PA (reprint author), Dipartimento Fis G Galilei, I-35131 Padua, Italy.
部门归属: [Marchetti, P. A.] Dipartimento Fis G Galilei, I-35131 Padua, Italy; [Marchetti, P. A.] Ist Nazl Fis Nucl, I-35131 Padua, Italy; [Ye, F.] Chinese Acad Sci, Grad Univ, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China; [Su, Z. B.; Yu, L.] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China; [Yu, L.] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
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.
收录类别: SCI
原文出处: 查看原文
语种: 英语
WOS记录号: WOS:000291518100008
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/14360
Appears in Collections:理论物理所2011年知识产出_期刊论文

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Recommended Citation:
Marchetti, PA,Ye, F,Su, ZB,et al. Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction[J]. JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,2011,72(5):337-340.
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