Superconducting Pairing Symmetries in Anisotropic Triangular Quantum Antiferromagnets
Gan, J. Y. · Chen, Yan · Zhang, F. C.
Original · EN
Motivated by the recent discovery of a low temperature spin liquid phase in layered organic compound κ-(ET)₂Cu₂(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 dₓ₂₋y₂+idxy symmetry near the isotropic limit and is gapless with dₓ₂₋y₂ symmetry at small anisotropy ratio.
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