Abstract
AbstractWe analyze the spin exchange interactions Jab and Jc in the A ‐type antiferromagnetic phase of KCuF3 and LaMnO3. One finds that the quasi one‐dimensional spin interactions in KCuF3 are consistent with the charge‐transfer type of insulating state, while the modifications of Jab and Jc by the charge‐transfer superexchange terms are moderate in the Mott insulator LaMnO3. We point out on the example of LaMnO3 that a reliable determination of the experimental microscopic parameters of spin‐orbital models is possible only when results of magnetic and optical experiments can be combined. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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