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@ARTICLE{Friemel:202822,
      author       = {Friemel, G. and Jang, H. and Schneidewind, A. and Ivanov,
                      A. and Dukhnenko, A. V. and Shitsevalova, N. Y. and Filipov,
                      V. B. and Keimer, B. and Inosov, D. S.},
      title        = {{M}agnetic field and doping dependence of low-energy spin
                      fluctuations in the antiferroquadrupolar compound {C}e $_{1
                      − x}$ {L}a $_{x}$ {B} $_{6}$},
      journal      = {Physical review / B},
      volume       = {92},
      number       = {1},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2015-04983},
      pages        = {014410},
      year         = {2015},
      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.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6G15 / G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)PANDA-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000357634800004},
      doi          = {10.1103/PhysRevB.92.014410},
      url          = {https://juser.fz-juelich.de/record/202822},
}