Systematic Study of Magnetic Interactions in Insulating Cuprates

Details Systematic Study of Magnetic Interactions in Insulating Cuprates Systematic Study of Magnetic Interactions in Insulating Cuprates

1999-12-29

arxiv.org/abs/cond-mat/9912480v2

Physics C 341-348 (2000) 473-474

Physics

Condensed Matter

Strongly Correlated Electrons

2 pages, 1 figure, with minor corrections, M2S-HTSC-VI conference proceedings

Scientific paper

The magnetic interactions in one-dimensional, two-dimensional (2D) and ladder cuprates are evaluated systematically by using small Cu-O clusters. We find that the superexchange interaction J between nearest neighbor Cu spins strongly depends on Cu-O structure through the Madelung potential, and in 2D and ladder cuprates there is a four-spin interaction Jcyc, with magnitude of 10% of J. We show that Jcyc has a strong influence on the magnetic excitation in the high-energy region of 2D cuprates.

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