Spin exchange and superconductivity in a t−J′−V model for two-dimensional quarter-filled systems

Andrés Greco; Jaime Merino; Adriana Foussats; Ross H. McKenzie

doi:10.1103/PhysRevB.71.144502

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Spin exchange and superconductivity in a t−J′−V model for two-dimensional quarter-filled systems

Andrés Greco, Jaime Merino, Adriana Foussats, Ross H. McKenzie

DOI 10.1103/PhysRevB.71.144502 · Physical Review B

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Abstract

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

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BEDT-TTF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown