The electronic structure and magnetic properties of the Jahn-Teller-distorted perovskite KAgF3 have been investigated using the full-potential linerized aug- mented plane-wave method. It is found that KAgF3 exhibits significant quasi-one- dimensional antiferromagnetism with the ratio of exchange constant jJ?j (perpen- dicular to the z axis) and J (along the z axis) about 0.04, although the sublattice of magnetic ion is three-dimensional. The strong quasi-one-dimensional antiferromag- netism originates from the C-antiferro-distortive orbital ordering of the Ag2+ 4d9 ions. The orbital ordered antiferromagnetic insulating state in KAgF3 is determined by on-site Coulomb repulsion to a large extent.
@article{arxiv.1007.0545,
title = {KAgF3: quasi-one-dimensional magnetism in three-dimensional magnetic ions sublattice},
author = {Xiaoli Zhang and Guoren Zhang and Ting Jia and Ying Guo and Zhi Zeng and H. Q. Lin},
journal= {arXiv preprint arXiv:1007.0545},
year = {2015}
}