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Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction
Marchetti, PA; Ye, F; Su, ZB; Yu, L; Marchetti, PA (reprint author), Dipartimento Fis G Galilei, I-35131 Padua, Italy.
2011
发表期刊JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
ISSN0022-3697
卷号72期号:5页码:337-340
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.
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
关键词T-j Model Fluctuations Crossover
学科领域Physics
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收录类别SCI
语种英语
WOS记录号WOS:000291518100008
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.itp.ac.cn/handle/311006/14360
专题理论物理所SCI论文
通讯作者Marchetti, PA (reprint author), Dipartimento Fis G Galilei, I-35131 Padua, Italy.
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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.
APA Marchetti, PA,Ye, F,Su, ZB,Yu, L,&Marchetti, PA .(2011).Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction.JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS,72(5),337-340.
MLA Marchetti, PA,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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