This title appears in the Scientific Report : 2020 

Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB 6
Portnichenko, P. Y.
Akbari, A. / Nikitin, S. E. / Cameron, A. S. / Dukhnenko, A. V. (Corresponding author) / Filipov, V. B. / Shitsevalova, N. Yu. / Čermák, P. / Radelytskyi, I. / Schneidewind, A. / Ollivier, J. / Podlesnyak, A. / Huesges, Z. / Xu, J. / Ivanov, A. / Sidis, Y. / Petit, S. / Mignot, J.-M. / Thalmeier, P. (Corresponding author) / Inosov, D. S. (Corresponding author)
Heinz Maier-Leibnitz Zentrum; MLZ
Streumethoden; JCNS-2
JCNS-FRM-II; JCNS-FRM-II
Physical review / X Expanding access X, 10 (2020) 2, S. 021010
College Park, Md. APS 2020
10.1103/PhysRevX.10.021010
Journal Article
Jülich Centre for Neutron Research (JCNS)
FRM II / MLZ
Quantum Condensed Matter: Magnetism, Superconductivity
OpenAccess
OpenAccess
Please use the identifier: http://hdl.handle.net/2128/24773 in citations.
Please use the identifier: http://dx.doi.org/10.1103/PhysRevX.10.021010 in citations.
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 Γ8 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.