Spin exchange and superconductivity in a t-J'-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'-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', increases the attraction between electrons in the dxy channel only, so that both charge and spin fluctuations work cooperatively to produce dxy pairing.
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