The change of the symmetry of the soft-mode spin wave at the spin-flop transition as observed in MnTiO3 using inelastic polarized neutron scattering

M. Steiner, K. Kakurai, B. Dorner, R. Pynn, J. Akimitsu

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2 Citations (Scopus)

Abstract

The energy and the eigenvector of the spin waves in MnTiO3 have been studied as functions of the applied magnetic field using inelastic neutron scattering with and without polarization analysis. It is found that the behaviour depends on the distance q from the antiferromagnetic zone centre: for q ≅ 0 the mode softens completely at the spin-flop field Hsf, but it has finite energy for q > 0 the eigenvector retains its Ising character for small q up to the highest fields measured (5 T = 0.86Hsf, assuming Hsf = 5.8 T), but it changes continuously with field from Ising to Heisenberg character for large q. A very strong, temperature-dependent line width was found at H = 6 T, close to Hsf, which is interpreted as further evidence for the soft-mode instability at the spin-flop transition.

Original languageEnglish
Pages (from-to)5905-5914
Number of pages10
JournalJournal of Physics Condensed Matter
Volume8
Issue number32
DOIs
Publication statusPublished - Aug 5 1996
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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