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Dispersionless Spin Waves and Underlying Field-Induced Magnetic Order in Gadolinium Gallium Garnet.

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Author

  • N d'Ambrumenil
  • O A Petrenko
  • H Mutka
  • Pascale Deen

Summary, in English

We report the results of neutron diffraction and inelastic neutron scattering on a powder sample of Gd_{3}Ga_{5}O_{12} at high magnetic fields. Analysis of the diffraction data shows that in high fields (B≳1.8 T) the spins are not fully aligned, but are canted slightly as a result of the dipolar interaction. The magnetic phase for fields ≲1.8 T is characterized by antiferromagnetic peaks at (210) and an incommensurate wave vector. The dominant contribution to inelastic scattering at large momentum transfers is from a band of almost dispersionless excitations. We show that these correspond to the spin waves localized on ten site rings, expected on the basis of nearest neighbor exchange interaction, and that the spectrum at high fields B≳1.8 T is well described by a spin wave theory.

Publishing year

2015

Language

English

Publication/Series

Physical Review Letters

Volume

114

Issue

22

Document type

Journal article

Publisher

American Physical Society

Topic

  • Accelerator Physics and Instrumentation

Status

Published

ISBN/ISSN/Other

  • ISSN: 1079-7114