Spin waves and other magnetic fluctuations in giant magnetoresistive perovskite manganites

T. G. Perring, G. Aeppli, S. M. Hayden, Y. Moritomo, Y. Tokura, J. P. Remeika, S. W. Cheong

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


We have used inelastic neutron scattering to measure the spin wave dispersion throughout the Brillouin zone of the double exchange ferromagnet La0.7Pb0.3MnO3. The dispersion is well described by that for the double exchange Hamiltonian. The Curie temperature calculated for a local moment ferromagnet with the observed dispersion agrees with experiment within 15%. In the paramagnetic phase of the two-dimensional analogue La1.2Sr1.8Mn2O7, we have observed long-lived antiferromagnetic clusters coexisting with ferromagnetic fluctuations. This effect must be included in theories that attempt to explain giant magnetoresistance in manganites, at least in two dimensions.

Original languageEnglish (US)
Pages (from-to)698-702
Number of pages5
JournalPhysica B: Condensed Matter
StatePublished - Jun 2 1997
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Critical scattering
  • Magnetoresistance
  • Perovskite compounds
  • Spin waves


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