Non-BCS Superconductivity in Cuprates from Attraction of Spin Vortices

doi:10.1088/1742-6596/400/2/022066

	Non-BCS Superconductivity in Cuprates from Attraction of Spin Vortices
	Marchetti, PA ; Ye, F ; Su, ZB ; Yu, L
	2012
会议日期	AUG 10-17, 2011
会议地点	Beijing, PEOPLES R CHINA
卷号	400
DOI	10.1088/1742-6596/400/2/022066
页码	UNSP 022066
英文摘要	We propose a non-BCS mechanism for superconductivity (SC) in hole-underdoped cuprates based on a gauge approach to the t-J model. The gluing force is a long-range attraction between spin vortices centered on the empty sites of two opposite Neel sublattices, leading to pairing of charge carriers (spinless holons). In the presence of these pairs, a gauge force coming from the single occupancy constraint induces, in turn, a RVB pairing of the spin carriers (spinons), gapped by scattering against spin-vortices. This gives rise to a finite density of incoherent hole pairs, precursor to superconductivity, supporting a Nernst signal whose anticipated contour plot is qualitatively consistent with experiments. The true superconducting transition occurs at an even lower temperature via a planar XY-type transition and it involves a kinetic energy gain due to lowering of the spinon gap. Since the short-range antiferromagnetic (AF) order and the holon pairing originate from the same term of the t-J model, this approach incorporates a strong interplay between AF and SC, giving rise to a universal relation between the energy of the resonance mode (bound state of spinons) and T-c, as observed in neutron scattering experiments.
会议录	26TH INTERNATIONAL CONFERENCE ON LOW TEMPERATURE PHYSICS (LT26), PTS 1-5
会议录出版者	IOP PUBLISHING LTD
会议录出版地	BRISTOL
语种	英语
URL标识	查看原文
ISSN号	1742-6588
WOS研究方向	Physics
内容类型	会议论文
源URL	[http://ir.itp.ac.cn/handle/311006/23612]
专题	SCI会议论文
作者单位	1.[Marchetti, P. A.] Ist Nazl Fis Nucl, Dipartimento Fis, I-35131 Padua, Italy 2.[Ye, F.] Grad Univ Chinese Acad Sci, Coll Mat Sci & Optoelectr Technol, Beijing 100049, Peoples R China 3.[Su, Z. B. 4.Yu, L.] Chinese Acad Sci, Inst Theoret Phys, Beijing 100190, Peoples R China 5.[Yu, L.] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China 6.[Yu, L.] Chinese Acad Sci, Inst 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 in Cuprates from Attraction of Spin Vortices[C]. 见:. Beijing, PEOPLES R CHINA. AUG 10-17, 2011.