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

P. Y. Portnichenko; A. Akbari; S. E. Nikitin; A. S. Cameron; A. V. Dukhnenko; V. B. Filipov; N. Yu Shitsevalova; P. Čermák; I. Radelytskyi; A. Schneidewind; J. Ollivier; A. Podlesnyak; Z. Huesges; J. Xu; A. Ivanov; Y. Sidis; S. Petit; J. M. Mignot; P. Thalmeier; D. S. Inosov

doi:10.1103/PhysRevX.10.021010

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

P. Y. Portnichenko, A. Akbari, S. E. Nikitin, A. S. Cameron, A. V. Dukhnenko, V. B. Filipov, N. Yu Shitsevalova, P. Čermák, I. Radelytskyi, A. Schneidewind, J. Ollivier, A. Podlesnyak, Z. Huesges, J. Xu, A. Ivanov, Y. Sidis, S. Petit, J. M. Mignot, P. Thalmeier, D. S. Inosov

Spectroscopy

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16 Scopus citations

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.

Original language	English
Article number	021010
Journal	Physical Review X
Volume	10
Issue number	2
DOIs	https://doi.org/10.1103/PhysRevX.10.021010
State	Published - Jun 2020

Funding

We thank Philippe Boutrouille (LLB), Ralf Feyerherm, Bastian Klemke, and Klaus Kiefer (HZB) for technical support during the experiments. A. A. and P. T. thank Ryousuke Shiina for help with the computations. Reduction of the TOF data was done using the H orace software package . This project was funded by the German Research Foundation (DFG) under the individual Grant No. IN209/3-2, from the projects C03 and C06 of the Collaborative Research Center SFB1143 at the TU Dresden (project-id 247310070), and via the Würzburg-Dresden Cluster of Excellence on Complexity and Topology in Quantum Matter—ct.qmat (EXC 2147, project-id 39085490). A. A. acknowledges financial support from the National Research Foundation (NRF) funded by the Ministry of Science of Korea (Grants No. 2016K1A4A01922028, No. 2017R1D1A1B03033465, and No. 2019R1H1A2039733). S. E. N. acknowledges support from the International Max Planck Research School for Chemistry and Physics of Quantum Materials (IMPRS-CPQM). Research at Oak Ridge National Laboratory’s Spallation Neutron Source was supported by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy.

Funders	Funder number
Ministry of Science of Korea	2019R1H1A2039733, 2016K1A4A01922028, 2017R1D1A1B03033465
Scientific User Facilities Division
U.S. Department of Energy
Basic Energy Sciences
Oak Ridge National Laboratory
Deutsche Forschungsgemeinschaft	IN209/3-2, SFB1143
Technische Universität Dresden	39085490, EXC 2147, 247310070
National Research Foundation of Korea
International Max Planck Research School for Chemistry and Physics of Quantum Materials

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10.1103/PhysRevX.10.021010

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Portnichenko, P. Y., Akbari, A., Nikitin, S. E., Cameron, A. S., Dukhnenko, A. V., Filipov, V. B., Shitsevalova, N. Y., 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., & Inosov, D. S. (2020). Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6. Physical Review X, 10(2), Article 021010. https://doi.org/10.1103/PhysRevX.10.021010

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title = "Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6",

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.",

author = "Portnichenko, {P. Y.} and A. Akbari and Nikitin, {S. E.} and Cameron, {A. S.} and Dukhnenko, {A. V.} and Filipov, {V. B.} and Shitsevalova, {N. Yu} and P. {\v C}erm{\'a}k and I. Radelytskyi and A. Schneidewind and J. Ollivier and A. Podlesnyak and Z. Huesges and J. Xu and A. Ivanov and Y. Sidis and S. Petit and Mignot, {J. M.} and P. Thalmeier and Inosov, {D. S.}",

note = "Publisher Copyright: {\textcopyright} 2020 authors. Published by the American Physical Society.",

year = "2020",

month = jun,

doi = "10.1103/PhysRevX.10.021010",

language = "English",

volume = "10",

journal = "Physical Review X",

issn = "2160-3308",

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Portnichenko, PY, Akbari, A, Nikitin, SE, Cameron, AS, Dukhnenko, AV, Filipov, VB, Shitsevalova, NY, Čermák, P, Radelytskyi, I, Schneidewind, A, Ollivier, J, Podlesnyak, A, Huesges, Z, Xu, J, Ivanov, A, Sidis, Y, Petit, S, Mignot, JM, Thalmeier, P & Inosov, DS 2020, 'Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6', Physical Review X, vol. 10, no. 2, 021010. https://doi.org/10.1103/PhysRevX.10.021010

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T1 - Field-Angle-Resolved Magnetic Excitations as a Probe of Hidden-Order Symmetry in CeB6

AU - Portnichenko, P. Y.

AU - Akbari, A.

AU - Nikitin, S. E.

AU - Cameron, A. S.

AU - Dukhnenko, A. V.

AU - Filipov, V. B.

AU - Shitsevalova, N. Yu

AU - Čermák, P.

AU - Radelytskyi, I.

AU - Schneidewind, A.

AU - Ollivier, J.

AU - Podlesnyak, A.

AU - Huesges, Z.

AU - Xu, J.

AU - Ivanov, A.

AU - Sidis, Y.

AU - Petit, S.

AU - Mignot, J. M.

AU - Thalmeier, P.

AU - Inosov, D. S.

PY - 2020/6

Y1 - 2020/6

N2 - 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.

AB - 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.

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DO - 10.1103/PhysRevX.10.021010

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JO - Physical Review X

JF - Physical Review X

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ER -

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

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