Diagonal superexchange in a simple square CuO$_2$ lattice
Abstract
Many microscopic models with the interaction between the next-nearest neighbours as a key parameter for cuprate physics have inspired us to study the diagonal superexchange interaction in a CuO layer. Our investigation shows that models with extended hopping provide a correct representation of magnetic interactions only in a hypothetical square CuO layer, where the diagonal superexchange interaction with the next-nearest neighbors always has the AFM nature. The conclusions are based on the symmetry prohibition on FM contribution to the diagonal superexchange between the next-nearest neighbors for a simple square CuO layer rather than for a real CuO layer, where diagonal AFM superexchange may be overestimated. We also discuss the reasons for magnetic frustration effects and high sensitivity of spin nanoinhomogeneity to square symmetry breaking.
Cite
@article{arxiv.2501.17432,
title = {Diagonal superexchange in a simple square CuO$_2$ lattice},
author = {V. A. Gavrichkov and S. I. Polukeev and S. G. Ovchinnikov},
journal= {arXiv preprint arXiv:2501.17432},
year = {2025}
}
Comments
12 pages, 4 figures