Detection of neutron scattering from phase IV of Ce0.7la 0.3B6: A confirmation of the octupole order

Keitaro Kuwahara, Kazuaki Iwasa, Masahumi Kohgi, Naofumi Aso, Masafumi Sera, Fumitoshi Iga

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57 Citations (Scopus)


We have performed a single crystal neutron scattering experiment on Ce 0.7La0.3B6 to microscopically investigate the order parameter of phase IV. Below the phase transition temperature 1.5K of phase IV, weak but distinct superlattice reflections at the scattering vector κ = (h/2, h/2; l/2) (h, l = odd number) have been observed for the first time by neutron scattering. The intensity of the superlattice reflections is stronger for high scattering vectors, which is quite different from the usual magnetic form factor of magnetic dipoles. This result directly evidences that the order parameter of phase IV has a complex magnetization density, consistent with the recent experimental and theoretical prediction in which the order parameter is the magnetic octupoles Tβ with Γ5 symmetry of the point group Oh. Neutron scattering experiments using short wavelength neutrons, as done in this study, could become a general method to study the high-rank multipoles in f electron systems.

Original languageEnglish
Article number093702
Journaljournal of the physical society of japan
Issue number9
Publication statusPublished - 2007 Sep


  • CeLaB
  • Neutron scattering
  • Octupole order
  • Phase IV

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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