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Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6
Authors
A. Akbari
A.S. Cameron
+18 more
A.V. Dukhnenko
V.B. Filipov
Z. Huesges
D.S. Inosov
A. Ivanov
J.-M. Mignot
S.E. Nikitin
J. Ollivier
S. Petit
A. Podlesnyak
P.Y. Portnichenko
I. Radelytskyi
A. Schneidewind
N.Yu. Shitsevalova
Y. Sidis
P. Thalmeier
J. Xu
P. Čermák
Publication date
1 January 2020
Publisher
College Park, Md. : APS
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Abstract
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. © 2020 authors. Published by the American Physical Society
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Last time updated on 23/07/2022