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The magnon dispersion in the charge, orbital and spin ordered phase inLa(0.5)Sr(1.5)MnO(4) has been studied by means of inelastic neutron scattering.We find an excellent agreement with a magnetic interaction model basing on theCE-type superstructure. The magnetic excitations are dominated by ferromagneticexchange parameters revealing a nearly-one dimensional character at highenergies. The nearest neighbor ferromagnetic interaction inLa(0.5)Sr(1.5)MnO(4) is significantly larger than the one in the metallicferromagnetically ordered manganites. The large ferromagnetic interaction inthe charge/orbital ordered phase appears to be essential for the capability ofmanganites to switch between metallic and insulating phases.Comment: 4 pages, 3 figure

physical review letters

Spin-Wave Dispersion in Orbitally Ordered<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>La</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Sr</mml:mi><mml:mrow><mml:mn>3</mml:mn><mml:mo>/</mml:mo><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>MnO</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:math>

Spin-Wave Dispersion in Orbitally OrderedLa1/2Sr3/2MnO4