Magnetic and thermodynamic properties of Sr2LaFe3O9
H. Kachkachi, P. Kornilovitch, Y. Meurdesoif, J. -C. Grenier, F. Zhou
Abstract
Using a Dirac-Heisenberg Hamiltonian with biquadratic exchange interactions, we study the effect of iron disproportionation on the magnetic ordering, and describe the first-order magnetic transition occurring in the perovskite Sr2LaFe3O9. Upon fitting the experimental data, we give an estimate of the exchange integrals for the antiferromagntic and ferromagnetic interactions, in agreement with previous works on kindered compounds. Spin-wave theory yields a magnon spectrum with a gapless antiferromagnetic mode together with two gapped ferromagnetic ones.
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