Magnetic dynamics in colossal magnetoresistive perovskite manganites

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

Research output: Contribution to journalArticlepeer-review


We have measured the spin-wave dispersion throughout the Brillouin zone of the double-exchange ferromagnet La0.7Pb0.3MnO3 by using inelastic neutron scattering. An unexpectedly simple Heisenberg Hamiltonian with solely a nearest-neighbour coupling accounts for the entire dispersion relation. The value of the Curie temperature TC calculated from the derived coupling constant agrees with the experimental value to within 15%. The results, including damping of the zone boundary spin waves near TC, can be fully understood in the framework of the double-exchange Hamiltonian. 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)1563-1575
Number of pages13
JournalPhilosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences
Issue number1742
StatePublished - Jul 15 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Mathematics(all)
  • Engineering(all)
  • Physics and Astronomy(all)


  • Antiferromagnetic fluctuations
  • Critical magnetic scattering
  • Heisenberg Hamiltonian
  • Spin waves


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