This title appears in the Scientific Report :
2015
Please use the identifier:
http://dx.doi.org/10.1103/PhysRevB.92.014410 in citations.
Please use the identifier: http://hdl.handle.net/2128/9020 in citations.
Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compound Ce $_{1 − x}$ La $_{x}$ B $_{6}$
Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compound Ce $_{1 − x}$ La $_{x}$ B $_{6}$
CeB6 is a model compound exhibiting antiferroquadrupolar (AFQ) order, its magnetic properties being typicallyinterpreted within localized models. More recently, the observation of strong and sharp magnetic exciton modesforming in its antiferromagnetic (AFM) state at both ferromagnetic and AFQ wave v...
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Personal Name(s): | Friemel, G. |
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Jang, H. / Schneidewind, A. / Ivanov, A. / Dukhnenko, A. V. / Shitsevalova, N. Y. / Filipov, V. B. / Keimer, B. / Inosov, D. S. (Corresponding author) | |
Contributing Institute: |
Streumethoden; JCNS-2 JCNS-FRM-II; JCNS-FRM-II |
Published in: | Physical Review B Physical review / B, 92 92 (2015 2015) 1 1, S. 014410 014410 |
Imprint: |
College Park, Md.
APS
2015
|
DOI: |
10.1103/PhysRevB.92.014410 |
Document Type: |
Journal Article |
Research Program: |
Jülich Centre for Neutron Research (JCNS) FRM II / MLZ |
Subject (ZB): | |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/9020 in citations.
CeB6 is a model compound exhibiting antiferroquadrupolar (AFQ) order, its magnetic properties being typicallyinterpreted within localized models. More recently, the observation of strong and sharp magnetic exciton modesforming in its antiferromagnetic (AFM) state at both ferromagnetic and AFQ wave vectors suggested a significantcontribution of itinerant electrons to the spin dynamics. Here we investigate the evolution of the AFQ excitationupon the application of an externalmagnetic field and the substitution of Cewith nonmagnetic La, both parametersknown to suppress the AFM phase.We find that the exciton energy decreases proportionally to TN upon doping. Infield, its intensity is suppressed, while its energy remains constant. Its disappearance above the critical field of theAFM phase is preceded by the formation of two modes, whose energies grow linearly with magnetic field uponentering the AFQ phase. These findings suggest a crossover from itinerant to localized spin dynamics betweenthe two phases, the coupling to heavy-fermion quasiparticles being crucial for a comprehensive description ofthe magnon spectrum. |