Spin exchange and superconductivity in a $t-J'-V$ model for two-dimensional quarter-filled systems

Details Spin exchange and superconductivity in a $t-J'-V$ model for two-dimensional quarter-filled systems Spin exchange and superconductivity in a $t-J'-V$ model for two-dimensional quarter-filled systems

2004-09-27

arxiv.org/abs/cond-mat/0409694v1

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 6 figures

Scientific paper

10.1103/PhysRevB.71.144502

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 d$_{xy}$ channel only, so that both charge and spin fluctuations work cooperatively to produce d$_{xy}$ pairing.

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