title: Quantized spin waves in the metallic state of magnetoresistive manganites.
abstract: Spin wave measurements have been carried out in ferromagnetic (F) La(1-x)(Sr,Ca)(x)MnO(3) with x(Sr) = 0.15, 0.175, 0.2, 0.3, and x(Ca) = 0.3. In all q directions, close to the zone boundary, the spin wave spectra consist of several energy levels, with the same values in the metallic and the x approximately 1/8 doping ranges. For x(Sr) = 0.15, the data are quantitatively interpreted in terms of quantized spin waves within 2D ordered F domains or clusters of 4a size. The same picture holds in the metallic state with, however, disordered clusters embedded in a 3D F matrix.
authors.affiliation: Institut Rayonnement Matière de Saclay, Laboratoire Léon Brillouin, CEA-CNRS UMR 12, CE-SACLAY, F-91191 Gif sur Yvette Cedex, France.
authors.forename: S
authors.initials: S
authors.lastname: Petit
authors.forename: M
authors.initials: M
authors.lastname: Hennion
authors.forename: F
authors.initials: F
authors.lastname: Moussa
authors.forename: D
authors.initials: D
authors.lastname: Lamago
authors.forename: A
authors.initials: A
authors.lastname: Ivanov
authors.forename: Y M
authors.initials: YM
authors.lastname: Mukovskii
authors.forename: D
authors.initials: D
authors.lastname: Shulyatev