Melting of magnetic correlations in charge-orbital ordered La(0.5)Sr(1.5)MnO(4) : competition of ferro and antiferromagnetic states

Abstract

The magnetic correlations in the charge- and orbital-ordered manganite La(0.5)Sr(1.5)MnO(4) have been studied by elastic and inelastic neutron scattering techniques. Out of the well-defined CE-type magnetic structure with the corresponding magnons a competition between CE-type and ferromagnetic fluctuations develops. Whereas ferromagnetic correlations are fully suppressed by the static CE-type order at low temperature, elastic and inelastic CE-type correlations disappear with the melting of the charge-orbital order at high temperature. In its charge-orbital disordered phase, La(0.5)Sr(1.5)MnO(4) exhibits a dispersion of ferromagnetic correlations which remarkably resembles the magnon dispersion in ferromagnetically ordered metallic perovskite manganites.

14 pages, 11 figures

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• Competing Ferromagnetic and Charge-Ordered States in Models for Manganites: the Origin of the CMR Effect
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Cited by in corpus (2)

• Electronic self-organization in the single-layer manganite $\mathrm{P}{\mathrm{r}}_{1-x}\mathrm{C}{\mathrm{a}}_{1+x}\mathrm{Mn}{\mathrm{O}}_4$
• Anticollinear order and degeneracy lifting in square lattice antiferromagnet LaSrCrO4