Journal Article

FZJ-2020-01755

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB 6

Portnichenko, P. Y. ; Akbari, A.Extern* ; Nikitin, S. E. ; Cameron, A. S. ; Dukhnenko, A. V. (Corresponding author) ; Filipov, V. B. ; Shitsevalova, N. Y. ; Čermák, P.Extern*FZJ* ; Radelytskyi, I.FZJ* ; Schneidewind, A.FZJ* ; Ollivier, J. ; Podlesnyak, A.Extern* ; Huesges, Z. ; Xu, J. ; Ivanov, A. ; Sidis, Y. ; Petit, S. ; Mignot, J.-M. ; Thalmeier, P. (Corresponding author) ; Inosov, D. S. (Corresponding author)

2020
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/24773  doi:10.1103/PhysRevX.10.021010

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.

Keyword(s): Magnetic Materials (1st) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS-FRM-II)
2. Streumethoden (JCNS-2)
3. Heinz Maier-Leibnitz Zentrum (MLZ)

Research Program(s):

1. 6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621) (POF3-621)
2. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
3. 6G4 - Jülich Centre for Neutron Research (JCNS) (POF3-623) (POF3-623)

Experiment(s):

1. PANDA: Cold three axes spectrometer (SR2)

Appears in the scientific report 2020

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Database coverage:
; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; IF >= 10 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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