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@ARTICLE{Guratinder:1045689,
      author       = {Guratinder, K. and Johnson, R. D. and Prabhakaran, D. and
                      Taylor, R. A. and Lang, F. and Blundell, S. J. and Taran, L.
                      S. and Streltsov, S. V. and Williams, T. J. and Giblin, S.
                      R. and Fennell, T. and Schmalzl, K. and Stock, C.},
      title        = {{M}agnetoelastic {D}ynamics of the {S}pin {J}ahn-{T}eller
                      {T}ransition in {C}o{T}i 2 {O} 5},
      journal      = {Physical review letters},
      volume       = {134},
      number       = {25},
      issn         = {0031-9007},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2025-03550},
      pages        = {256702},
      year         = {2025},
      abstract     = {CoTi2⁢O5has the paradox that low temperature static
                      magnetic order is incompatible with the crystal structure
                      owing to a mirror plane that exactly frustrates magnetic
                      interactions. Despite no observable structural distortion
                      with diffraction, CoTi2⁢O5does magnetically order below
                      𝑇𝑁∼25  Kwith the breaking of spin ground state
                      degeneracy proposed to be a realization of the spin
                      Jahn-Teller effect in analogy to the celebrated orbital
                      Jahn-Teller transition. We apply neutron and Raman
                      spectroscopy to study the dynamics of this transition in
                      CoTi2⁢O5. We find anomalous acoustics associated with a
                      symmetry breaking strain that characterizes the spin
                      Jahn-Teller transition. Crucially, the energy of this phonon
                      coincides with the energy scale of the magnetic excitations,
                      and has the same symmetry of an optic mode, observed with
                      Raman spectroscopy, which atypically softens in energy with
                      decreasing temperature. Taken together, we propose that the
                      energetics of the spin Jahn-Teller effect in CoTi2⁢O5are
                      related to cooperative magnetoelastic fluctuations as
                      opposed to conventional soft critical dynamics which
                      typically drive large measurable static displacements.},
      cin          = {JCNS-2 / JARA-FIT / JCNS-ILL},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (FZJ) (POF4-6G4)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G4},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1103/sr9s-ll1y},
      url          = {https://juser.fz-juelich.de/record/1045689},
}