Spin waves throughout the brillouin zone of a double-exchange ferromagnet

T. G. Perring, G. Aeppli, S. M. Hayden, S. A. Carter, J. P. Remeika, S. W. Cheong

Research output: Contribution to journalArticlepeer-review

174 Scopus citations

Abstract

We use inelastic neutron scattering to measure the spin wave dispersion throughout the Brillouin zone of the double-exchange ferromagnet La0.7Pb0.3MnO3. Magnons with energies as high as 95 meV are directly observed and an unexpectedly simple Heisenberg Hamiltonian, with solely a nearest-neighbor coupling of 8.79+/-0.21 meV, accounts for the entire dispersion relation. The calculated Curie temperature for this local moment Hamiltonian overestimates the measured Curie point (355 K) by only 15%. Raising temperature yields unusual broadening of the high frequency spin waves, even within the ferromagnetic phase.

Original languageEnglish (US)
Pages (from-to)711-714
Number of pages4
JournalPhysical review letters
Volume77
Issue number4
DOIs
StatePublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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