Spin exchange and superconductivity in a $t-J^{\prime }-V$ model for two-dimensional quarter-filled systems

Abstract

The effect of antiferromagnetic spin fluctuations on two-dimensional quarter-filled systems is studied theoretically. An effective $t-J^{\prime }-V$ model on a square lattice which accounts for checkerboard charge fluctuations and next-nearest-neighbors antiferromagnetic spin fluctuations is considered. From calculations based on large-N theory on this model it is found that the exchange interaction, $J^{\prime }$, increases the attraction between electrons in the d${}_{xy}$ channel only, so that both charge and spin fluctuations work cooperatively to produce d${}_{xy}$ pairing.

9 pages, 6 figures

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• Electrodynamics of Correlated Electron Materials
• Theoretical Aspects of Charge Ordering in Molecular Conductors
• Strong electronic correlations in superconducting organic charge transfer salts
• Domain-wall excitons and optical conductivity in one-dimensional Wigner lattices
• Mixed order parameters, accidental nodes and broken time reversal symmetry in organic superconductors: a group theoretical analysis
• One-electron self energies and spectral functions for the t-J model in the large-N limit
• Electron-phonon interaction dressed by electronic correlations near charge ordering as the origin for superconductivity in cobaltates
• Tuning competition between charge order and superconductivity in the square-lattice $t$-$t^{\prime }$-$J$ model
• Density Matrix Renormalization Group study of superconducting pairing near the quarter-filled Wigner crystal