Symmetry of the superconducting order parameter in frustrated systems determined by the spatial anisotropy of spin correlations

Abstract

We study the resonating valence bond (RVB) theory of the Hubbard-Heisenberg model on the half-filled anisotropic triangular lattice. Varying the frustration changes the wavevector of maximum spin correlation in the Mott insulating phase. This, in turn, changes the symmetry of the superconducting state, that occurs at the boundary of the Mott insulating phase. We propose that this physics is realised in several families of quasi-two-dimensional organic superconductors.

To appear in Phys. Rev. Lett. - 5 pages, 4 figs

References in corpus (6)

• Mott Transition, Antiferromagnetism, and d-wave Superconductivity in Two-Dimensional Organic Conductors
• Strong electronic correlations in superconducting organic charge transfer salts
• Comparison of the phase diagram of the half-filled layered organic superconductors with the phase diagram of the RVB theory of the Hubbard-Heisenberg model
• Superconductivity and a Mott Transition in a Hubbard Model on an Anisotropic Triangular Lattice
• Edge-currents in superconductors with a broken time-reversal symmetry
• Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis

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