Evolution of spin-wave excitations in ferromagnetic metallic manganites

F. Ye, Pengcheng Dai, J. A. Fernandez-Baca, Hao Sha, J. W. Lynn, H. Kawano-Furukawa, Y. Tomioka, Y. Tokura, Jiandi Zhang

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42 Scopus citations

Abstract

Neutron scattering results are presented for spin-wave excitations of three ferromagnetic metallic A1-x Ax, MnO3 manganites (where A and are rare- and alkaline-earth-metal ions), which when combined with previous work elucidate the systematics of the interactions as a function of carrier concentration x, on-site disorder, and strength of the lattice distortion. The long-wavelength spin dynamics show only a very weak dependence across the series. The ratio of fourth to first neighbor exchange (J4/J1) that controls the zone boundary magnon softening changes systematically with x, but does not depend on the other parameters. None of the prevailing models can account for these behaviors.

Original languageEnglish
Article number047204
JournalPhysical Review Letters
Volume96
Issue number4
DOIs
StatePublished - 2006

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