Magnon damping by magnon-phonon coupling in manganese perovskites

Pengcheng Dai, H. Hwang, Jiandi Zhang, J. Fernandez-Baca, S. Cheong, C. Kloc, Y. Tomioka, Y. Tokura

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132 Scopus citations


Inelastic neutron scattering was used to systematically investigate the spin-wave excitations (magnons) in ferromagnetic manganese perovskites. In spite of the large differences in the Curie temperatures (Formula presented) of different manganites, their low-temperature spin waves have very similar dispersions with the zone-boundary magnon softening and broadening that cannot be explained by the canonical double exchange mechanism. From the wave-vector dependence of the magnon lifetime effects and its correlation with the dispersions of the optical-phonon modes, we argue that a strong magnetoelastic (magnon-phonon) coupling is responsible for the observed low-temperature anomalous spin dynamical behavior of the manganites.

Original languageEnglish (US)
Pages (from-to)9553-9557
Number of pages5
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number14
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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