Damping of antiferromagnetic spin waves by valence fluctuations in the double layer perovskite YBaFe2O5

Details Damping of antiferromagnetic spin waves by valence fluctuations in the double layer perovskite YBaFe2O5 Damping of antiferromagnetic spin waves by valence fluctuations in the double layer perovskite YBaFe2O5

2007-02-07

arxiv.org/abs/cond-mat/0702181v1

Physics

Condensed Matter

Strongly Correlated Electrons

RevTeX, 4 pages, 4 figures, submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.99.037202

Inelastic neutron scattering experiments show that spin dynamics in the charge ordered insulating ground state of the double-layer perovskite YBaFe2O5 is well described in terms of eg superexchange interactions. Above the Verwey transition at TV = 308 K, t2g double exchange-type conduction within antiferromagnetic FeO2--BaO--FeO2 double layers proceeds by an electron hopping process that requires a spin flip of the five-fold coordinated Fe ions, costing an energy 5S^2 of approximately 0.1 eV. The hopping process disrupts near-neighbor spin correlations, leading to massive damping of zone-boundary spin waves.

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