Origin of the long-wavelength magnetic modulation in Ca3Co2O6

Details Origin of the long-wavelength magnetic modulation in Ca3Co2O6 Origin of the long-wavelength magnetic modulation in Ca3Co2O6

2008-11-13

arxiv.org/abs/0811.2208v1

Physics

Condensed Matter

Materials Science

Scientific paper

The origin of the long-wavelength incommensurate magnetic structure of Ca3Co2O6 is discussed considering possible inter-chains super-superexchange paths. The experimental value of the propagation vector k=(0,0,$\Delta$) with $\Delta$ $>$ 1 can be reproduced only if one considers the next nearest super-superexchange interaction. A spin-dimer analysis using the Extended-Huckel Tight-Binding method confirms that, despite longer interatomic Co-Co distances, the latter interaction is indeed much stronger. The stability of the observed structure with respect to certain commensurate states is discussed.

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