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@ARTICLE{Tymoshenko:840399,
      author       = {Tymoshenko, Y. V. and Onykiienko, Y. A. and Müller, T. and
                      Thomale, R. and Rachel, S. and Cameron, A. S. and
                      Portnichenko, P. Y. and Efremov, D. V. and Tsurkan, V. and
                      Abernathy, D. L. and Ollivier, J. and Schneidewind, Astrid
                      and Piovano, A. and Felea, V. and Loidl, A. and Inosov, D.
                      S.},
      title        = {{P}seudo-{G}oldstone {M}agnons in the {F}rustrated {S}=3=2
                      {H}eisenberg {H}elimagnet {Z}n{C}r2{S}e4with a {P}yrochlore
                      {M}agnetic {S}ublattice},
      journal      = {Physical review / X},
      volume       = {7},
      issn         = {2160-3308},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2017-07932},
      pages        = {041049},
      year         = {2017},
      abstract     = {Low-energy spin excitations in any long-range ordered
                      magnetic system in the absence of
                      magnetocrystallineanisotropy are gapless Goldstone modes
                      emanating from the ordering wave vectors. Inhelimagnets,
                      these modes hybridize into the so-called helimagnon
                      excitations. Here we employ neutronspectroscopy supported by
                      theoretical calculations to investigate the magnetic
                      excitation spectrum of theisotropic Heisenberg helimagnet
                      ZnCr2Se4 with a cubic spinel structure, in which spin-3=2
                      magnetic Cr3þions are arranged in a geometrically
                      frustrated pyrochlore sublattice. Apart from the
                      conventionalGoldstone mode emanating from the ð0 0 qhÞ
                      ordering vector, low-energy magnetic excitations in
                      thesingle-domain proper-screw spiral phase show soft
                      helimagnon modes with a small energy gap of∼0.17 meV,
                      emerging from two orthogonal wave vectors ðqh 00Þ and ð0
                      qh 0Þ where no magnetic Braggpeaks are present. We term
                      them pseudo-Goldstone magnons, as they appear gapless within
                      linear spinwavetheory and only acquire a finite gap due to
                      higher-order quantum-fluctuation corrections. Our resultsare
                      likely universal for a broad class of symmetric helimagnets,
                      opening up a new way of studying weakmagnon-magnon
                      interactions with accessible spectroscopic methods.},
      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:000416432000002},
      doi          = {10.1103/PhysRevX.7.041049},
      url          = {https://juser.fz-juelich.de/record/840399},
}