Journal Article

FZJ-2015-04983

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Magnetic field and doping dependence of low-energy spin fluctuations in the antiferroquadrupolar compound Ce $_{1 − x}$ La $_{x}$ B $_{6}$

Friemel, G. ; Jang, H. ; Schneidewind, A.FZJ* ; Ivanov, A. ; Dukhnenko, A. V. ; Shitsevalova, N. Y. ; Filipov, V. B. ; Keimer, B. ; Inosov, D. S. (Corresponding author)

2015
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/9020  doi:10.1103/PhysRevB.92.014410

Abstract: 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.

Keyword(s): Basic research (1st) ; Others (1st) ; Condensed Matter Physics (2nd) ; Magnetism (2nd)

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Contributing Institute(s):

1. JCNS-FRM-II (JCNS (München) ; Jülich Centre for Neutron Science JCNS (München) ; JCNS-FRM-II)
2. Streumethoden (JCNS-2)

Research Program(s):

1. 6G15 - FRM II / MLZ (POF3-6G15) (POF3-6G15)
2. 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 2015

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Database coverage:
; ; ; Current Contents - Physical, Chemical and Earth Sciences ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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