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

Portnichenko, P. Y., Akbari, A., Nikitin, S. E., Cameron, A. S., Dukhnenko V, A., Filipov, V. B., et al. (2020). Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6. Physical Review X, 10(2): 021010, pp. 1-19. doi:10.1103/PhysRevX.10.021010.

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 Creators:
Portnichenko, P. Y.1, Author
Akbari, A.2, Author              
Nikitin, S. E.3, Author              
Cameron, A. S.1, Author
Dukhnenko V, A.1, Author
Filipov, V. B.1, Author
Shitsevalova, N. Yu1, Author
Čermák, P.1, Author
Radelytskyi, I1, Author
Schneidewind, A.1, Author
Ollivier, J.1, Author
Podlesnyak, A.1, Author
Huesges, Z.1, Author
Xu, J.1, Author
Ivanov, A.1, Author
Sidis, Y.1, Author
Petit, S.1, Author
Mignot, J.-M.1, Author
Thalmeier, P.4, Author              
Inosov, D. S.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
3Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863462              
4Peter Thalmeier, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863457              

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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 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.

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Language(s): eng - English
 Dates: 2020-04-142020-04-14
 Publication Status: Published in print
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Title: Physical Review X
  Abbreviation : Phys. Rev. X
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 10 (2) Sequence Number: 021010 Start / End Page: 1 - 19 Identifier: Other: 2160-3308
CoNE: https://pure.mpg.de/cone/journals/resource/2160-3308