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Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction
Marchetti, PA; Ye, F; Su, ZB; Yu, L
2011
Conference NameInternational Conference on Spectroscopies in Novel Superconductors (SNS2010)
Source PublicationJOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
Volume72
Issue5
Pages337-340
Conference DateMAY 23-28, 2010
Conference PlaceShanghai, PEOPLES R CHINA
Publication PlaceOXFORD
ISSN0022-3697
PublisherPERGAMON-ELSEVIER SCIENCE LTD
AbstractWithin 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.
KeywordT-J MODEL FLUCTUATIONS CROSSOVER
DOI10.1016/j.jpcs.2010.10.058
URL查看原文
Indexed ByCPCI
Language英语
WOS Research AreaChemistry ; Physics
WOS SubjectChemistry, Multidisciplinary ; Physics, Condensed Matter
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type会议论文
Identifierhttp://ir.itp.ac.cn/handle/311006/23618
CollectionSCI会议论文
Affiliation1.[Marchetti, P. A.] Dipartimento Fis G Galilei, I-35131 Padua, Italy
2.[Marchetti, P. A.] Ist Nazl Fis Nucl, I-35131 Padua, Italy
3.[Ye, F.] Chinese Acad Sci, Grad Univ, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China
4.[Su, Z. B.
5.Yu, L.] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China
6.[Yu, L.] Chinese Acad Sci, Inst Phys, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Marchetti, PA,Ye, F,Su, ZB,et al. Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction[C]. OXFORD:PERGAMON-ELSEVIER SCIENCE LTD,2011:337-340.
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