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Abstract: The origin of the long-wavelength incommensurate magnetic structure ofCa3Co2O6 is discussed considering possible inter-chains super-superexchangepaths. The experimental value of the propagation vector k=0,0,$\Delta$ with$\Delta$ $>$ 1 can be reproduced only if one considers the next nearestsuper-superexchange interaction. A spin-dimer analysis using theExtended-Huckel Tight-Binding method confirms that, despite longer interatomicCo-Co distances, the latter interaction is indeed much stronger. The stabilityof the observed structure with respect to certain commensurate states isdiscussed.



Author: L.C. Chapon

Source: https://arxiv.org/







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