Superconducting pairing symmetries in anisotropic triangular quantum antiferromagnets

被引：20

作者：

Gan, J. Y. ^{[1
]}

Chen, Yan

Zhang, F. C.

机构：

[1] Tsinghua Univ, Ctr Adv Study, Beijing 100084, Peoples R China

[2] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China

[3] Univ Hong Kong, Ctr Theoret & Computat Phys, Hong Kong, Hong Kong, Peoples R China

来源：

PHYSICAL REVIEW B | 2006年 / 74卷 / 09期

关键词：

LAYERED ORGANIC SUPERCONDUCTORS; T-J MODEL; PENETRATION DEPTH; CUPRATE SUPERCONDUCTORS; C-13; NMR; STATES; CONDUCTOR; LATTICE; TEMPERATURE; RELAXATION;

D O I：

10.1103/PhysRevB.74.094515

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Motivated by the recent discovery of a low temperature spin liquid phase in layered organic compound kappa-(ET)(2)Cu-2(CN)(3) which becomes a superconductor under pressure, we examine the phase transition of Mott insulating and superconducting (SC) states in a Hubbard-Heisenberg model on an anisotropic triangular lattice. We use a renormalized mean field theory to study the Gutzwiller projected BCS wave functions. The half filled electron system is a Mott insulator at large onsite repulsion U, and is a superconductor at a moderate U. The symmetry of the SC state depends on the anisotropy, and is gapful with d(x2-y2)+id(xy) symmetry near the isotropic limit and is gapless with d(x2-y2) symmetry at small anisotropy ratio.

引用

页数：6

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