Non-BCS superconductivity for underdoped cuprates by spin-vortex attraction
文献类型：会议论文
| 作者 | Marchetti, PA; Ye, F; Su, ZB ; Yu, L
|
| 出版日期 | 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 |
| 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 Phys, Beijing 100190, Peoples R China 2.[Marchetti, P. A.] Dipartimento Fis G Galilei, I-35131 Padua, Italy 3.[Marchetti, P. A.] Ist Nazl Fis Nucl, I-35131 Padua, Italy 4.[Ye, F.] Chinese Acad Sci, Grad Univ, Coll Mat Sci & Optoelect Technol, Beijing 100049, Peoples R China 5.[Su, Z. B. 6.Yu, L.] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China |
| 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. |
入库方式： OAI收割
来源：理论物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。