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The electronic structure and magnetic properties of the Jahn-Teller-distortedperovskite KAgF3 have been investigated using the full-potential linerized aug-mented plane-wave method. It is found that KAgF3 exhibits significantquasi-one- dimensional antiferromagnetism with the ratio of exchange constantjJ?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 strongquasi-one-dimensional antiferromag- netism originates from theC-antiferro-distortive orbital ordering of the Ag2+ 4d9 ions. The orbitalordered antiferromagnetic insulating state in KAgF3 is determined by on-siteCoulomb repulsion to a large extent.

KAgF3: quasi-one-dimensional magnetism in three-dimensional magnetic ions sublattice