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@ARTICLE{Weber:839914,
      author       = {Weber, T. and Roessli, B. and Stock, C. and Keller, T. and
                      Schmalzl, K. and Bourdarot, F. and Georgii, R. and Ewings,
                      R. A. and Perry, R. S. and Böni, P.},
      title        = {{T}ransverse acoustic phonon anomalies at intermediate wave
                      vectors in {M}g{V} 2 {O} 4},
      journal      = {Physical review / B},
      volume       = {96},
      number       = {18},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-07492},
      pages        = {184301},
      year         = {2017},
      abstract     = {Magnetic spinels (with chemical formula AX2O4, with X a 3d
                      transition metal ion) that also have an orbital degeneracy
                      are Jahn-Teller active and hence possess a coupling between
                      spin and lattice degrees of freedom. At high temperatures,
                      MgV2O4 is a cubic spinel based on V3+ ions with a spin S=1
                      and a triply degenerate orbital ground state. A structural
                      transition occurs at TOO=63 K to an orbitally ordered phase
                      with a tetragonal unit cell followed by an antiferromagnetic
                      transition of TN=42 K on cooling. We apply neutron
                      spectroscopy in single crystals of MgV2O4 to show an anomaly
                      for intermediate wave vectors at TOO associated with the
                      acoustic phonon sensitive to the shear elastic modulus
                      (C11−C12)/2. On warming, the shear mode softens for
                      momentum transfers near close to half the Brillouin zone
                      boundary, but recovers near the zone center. High resolution
                      spin-echo measurements further illustrate a temporal
                      broadening with increased temperature over this intermediate
                      range of wave vectors, indicative of a reduction in phonon
                      lifetime. A subtle shift in phonon frequencies over the same
                      range of momentum transfers is observed with magnetic
                      fields. We discuss this acoustic anomaly in context of
                      coupling to orbital and charge fluctuations.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-ILL},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-Juel1)ILL-IN12-20150421},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000414526200004},
      doi          = {10.1103/PhysRevB.96.184301},
      url          = {https://juser.fz-juelich.de/record/839914},
}