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.
@article{arxiv.cond-mat/9912480,
title = {Systematic Study of Magnetic Interactions in Insulating Cuprates},
author = {Yoshiaki Mizuno and Takami Tohyama and Sadamichi Maekawa},
journal= {arXiv preprint arXiv:cond-mat/9912480},
year = {2015}
}
Comments
2 pages, 1 figure, with minor corrections, M2S-HTSC-VI conference proceedings