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

doi:10.1016/j.jpcs.2010.10.058

	Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction
	Marchetti, PA ; Ye, F ; Su, ZB ; Yu, L
	2011
会议日期	MAY 23-28, 2010
会议地点	Shanghai, PEOPLES R CHINA
关键词	T-J MODEL FLUCTUATIONS CROSSOVER
卷号	72
期号	5
DOI	10.1016/j.jpcs.2010.10.058
页码	337-340
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.
会议录	JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
会议录出版者	PERGAMON-ELSEVIER SCIENCE LTD
会议录出版地	OXFORD
语种	英语
URL标识	查看原文
ISSN号	0022-3697
WOS研究方向	Chemistry ; Physics
内容类型	会议论文
源URL	[http://ir.itp.ac.cn/handle/311006/23618]
专题	SCI会议论文
作者单位	1.Yu, L.] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China 2.[Yu, L.] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China 3.[Marchetti, P. A.] Dipartimento Fis G Galilei, I-35131 Padua, Italy 4.[Marchetti, P. A.] Ist Nazl Fis Nucl, I-35131 Padua, Italy 5.[Ye, F.] Chinese Acad Sci, Grad Univ, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China 6.[Su, Z. B.
推荐引用方式 GB/T 7714	Marchetti, PA,Ye, F,Su, ZB,et al. Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction[C]. 见:. Shanghai, PEOPLES R CHINA. MAY 23-28, 2010.