Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6

Research output: Contribution to journalResearch articleContributedpeer-review


  • P. Y. Portnichenko - , Technische Universität Dresden (Author)
  • A. Akbari - , Pohang University of Science and Technology, Max Planck-POSTECH Center for Complex Phase Materials (Author)
  • S. E. Nikitin - , Technische Universität Dresden, Max Planck Institute for Chemical Physics of Solids (Author)
  • A. S. Cameron - , Technische Universität Dresden (Author)
  • A. Dukhnenko - , NASU - Institute for Problems of Materials Science (Author)
  • V. B. Filipov - , NASU - Institute for Problems of Materials Science (Author)
  • N. Yu Shitsevalova - , NASU - Institute for Problems of Materials Science (Author)
  • P. Cermak - , Charles University (Author)
  • Radelytskyi - , Jülich Research Centre (Author)
  • A. Schneidewind - , Jülich Research Centre (Author)
  • J. Ollivier - , Institut Laue-Langevin (Author)
  • A. Podlesnyak - , United States Department of Energy (Author)
  • Z. Huesges - , Helmholtz Centre Berlin for Materials and Energy (Author)
  • J. Xu - , Helmholtz Centre Berlin for Materials and Energy (Author)
  • A. Ivanov - , Institut Laue-Langevin (Author)
  • Y. Sidis - , Université Paris-Saclay (Author)
  • S. Petit - , Université Paris-Saclay (Author)
  • J-M Mignot - , Université Paris-Saclay (Author)
  • P. Thalmeier - , Max Planck Institute for Chemical Physics of Solids (Author)
  • D. S. Inosov - , Technische Universität Dresden (Author)


In contrast to magnetic order formed by electrons' dipolar moments, ordering phenomena associated with higher-order multipoles (quadrupoles, octupoles, etc.) are more difficult to characterize because of the limited choice of experimental probes that can distinguish different multipolar moments. The heavy-fermion compound CeB6 and its La-diluted alloys are among the best-studied realizations of the long-range-ordered multipolar phases, often referred to as "hidden order." Previously, the hidden order in phase II was identified as primary antiferroquadrupolar and field-induced octupolar order. Here, we present a combined experimental and theoretical investigation of collective excitations in phase II of CeB6. Inelastic neutron scattering (INS) in fields up to 16.5 T reveals a new high-energy mode above 14 T in addition to the low-energy magnetic excitations. The experimental dependence of their energy on the magnitude and angle of the applied magnetic field is compared to the results of a multipolar interaction model. The magnetic excitation spectrum in a rotating field is calculated within a localized approach using the pseudospin representation for the Gamma(8) states. We show that the rotating-field technique at fixed momentum can complement conventional INS measurements of the dispersion at a constant field and holds great promise for identifying the symmetry of multipolar order parameters and the details of intermultipolar interactions that stabilize hidden-order phases.


Original languageEnglish
Article number021010
Number of pages19
JournalPhysical Review X
Issue number2
Publication statusPublished - 14 Apr 2020
Externally publishedYes

External IDs

Scopus 85090875899




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