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Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction | |
Marchetti, PA; Ye, F; Su, ZB![]() ![]() | |
2011 | |
Conference Name | International Conference on Spectroscopies in Novel Superconductors (SNS2010) |
Source Publication | JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS |
Volume | 72 |
Issue | 5 |
Pages | 337-340 |
Conference Date | MAY 23-28, 2010 |
Conference Place | Shanghai, PEOPLES R CHINA |
Publication Place | OXFORD |
ISSN | 0022-3697 |
Publisher | PERGAMON-ELSEVIER SCIENCE LTD |
Abstract | 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. |
Keyword | T-J MODEL FLUCTUATIONS CROSSOVER |
DOI | 10.1016/j.jpcs.2010.10.058 |
URL | 查看原文 |
Indexed By | CPCI |
Language | 英语 |
WOS Research Area | Chemistry ; Physics |
WOS Subject | Chemistry, Multidisciplinary ; Physics, Condensed Matter |
Citation statistics | |
Document Type | 会议论文 |
Identifier | http://ir.itp.ac.cn/handle/311006/23618 |
Collection | SCI会议论文 |
Affiliation | 1.[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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