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Spin exchange and superconductivity in a $t-J'-V$ model for two-dimensional quarter-filled systems | | Andres Greco
; Jaime Merino
; Adriana Foussats
; Ross H. McKenzie
; | | Date: |
27 Sep 2004 | | Subject: | Strongly Correlated Electrons; Superconductivity | cond-mat.str-el cond-mat.supr-con | | 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 d$_{xy}$ channel only, so that both charge and spin fluctuations work cooperatively to produce d$_{xy}$ pairing. | | Source: | arXiv, cond-mat/0409694 | | Services: | Forum | Review | PDF | Favorites | |
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