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Non-BCS Superconductivity in Cuprates from Attraction of Spin Vortices
Marchetti, PA; Ye, F; Su, ZB; Yu, L
Conference Name26th International Conference on Low Temperature Physics (LT)
PagesUNSP 022066
Conference DateAUG 10-17, 2011
Conference PlaceBeijing, PEOPLES R CHINA
Publication PlaceBRISTOL
AbstractWe 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.
Indexed ByCPCI
WOS Research AreaPhysics
WOS SubjectPhysics, Applied ; Physics, Multidisciplinary ; Physics, Condensed Matter
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Document Type会议论文
Affiliation1.[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
Recommended Citation
GB/T 7714
Marchetti, PA,Ye, F,Su, ZB,et al. Non-BCS Superconductivity in Cuprates from Attraction of Spin Vortices[C]. BRISTOL:IOP PUBLISHING LTD,2012:UNSP 022066.
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