Abstract
Electronic structure calculation has been carried out for quantum spin system Sr2Fe3S2O3 with an aim to figure out the underlying spin model. We present first-principles density functional calculation to study the electronic and magnetic properties of Sr2Fe3S2O3. We discuss explicitly the nature of the exchange paths and provide quantitative estimates of magnetic exchange couplings. A microscopic modelling based on analysis of the electronic structure of this system puts it in the interesting class of 2-D antiferromagnetic spin S=2 ladder system
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