• DOI:10.1103/PhysRevX.10.021010
• Corpus ID: 209862284

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

@article{Portnichenko2020FieldAngleResolvedME,
  title={Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in 
CeB6},
  author={Pavlo Y. Portnichenko and Alireza Akbari and S E Nikitin and Alistair S. Cameron and Anatoliy V. Dukhnenko and V Filipov and Natalya Y Shitsevalova and Petr {\vC}erm{\'a}k and I. Radelytskyi and Astrid Schneidewind and Jacques Ollivier and Andrey A. Podlesnyak and Zita Huesges and J. Xu and Alexandre S. Ivanov and Yvan Sidis and Sylvain Petit and J-M Mignot and Peter Thalmeier and Dmytro S. Inosov},
  journal={Physical Review X},
  year={2020}
}

• P. Portnichenko, A. Akbari, +17 authors D. Inosov
• Published 6 January 2020
• Physics
• Physical Review X

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 (AFQ) and field-induced octupolar (AFO) order. Here we present a combined experimental and theoretical investigation of collective excitations in the 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 rotating field is calculated within a localized approach using the pseudo-spin presentation for the Gamma8 states. We show that the rotating-field technique at fixed momentum can complement conventional INS measurements of the dispersion at constant field and holds great promise for identifying the symmetry of multipolar order parameters and the details of inter-multipolar interactions that stabilize hidden-order phases.