Superconducting Pairing Symmetries in Anisotropic Triangular Quantum Antiferromagnets

Details Superconducting Pairing Symmetries in Anisotropic Triangular Quantum Antiferromagnets Superconducting Pairing Symmetries in Anisotropic Triangular Quantum Antiferromagnets

2006-05-09

arxiv.org/abs/cond-mat/0605214v1

Phys. Rev. B 74, 094515 (2006)

Physics

Condensed Matter

Superconductivity

6 pages, 5 figures

Scientific paper

10.1103/PhysRevB.74.094515

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 wavefucntions. The half filled electron system is a Mott insulator at large on-site repulsion $U$, and is a superconductor at a moderate $U$. The symmetry of the SC state depends on the anisotropy, and is gapful with $d_{x^2-y^2}+id_{xy}$ symmetry near the isotropic limit and is gapless with $d_{x^2-y^2}$ symmetry at small anisotropy ratio.

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