Magnetic and thermodynamic properties of Sr_{2}LaFe_{3}O_{9}

Details Magnetic and thermodynamic properties of Sr_{2}LaFe_{3}O_{9} Magnetic and thermodynamic properties of Sr_{2}LaFe_{3}O_{9}

1997-03-04

arxiv.org/abs/cond-mat/9703044v1

J. Mag. Mag. Mat. 172 (1997) 173-182

Physics

Condensed Matter

Strongly Correlated Electrons

8 pages of RevTex, 5 figures (available upon request), submitted to J. Mag. Mag. Mat

Scientific paper

10.1016/S0304-8853(97)00084-X

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 Sr_{2}LaFe_{3}O_{9}. 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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