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@ARTICLE{Mittal:837907,
      author       = {Mittal, R. and Pintschovius, L. and Lamago, D. and Heid, R.
                      and Bohnen, K-P and Reznik, D. and Chaplot, S. L. and Su, Y.
                      and Kumar, N. and Dhar, S. K. and Thamizhavel, A. and
                      Brückel, Thomas},
      title        = {{A}nomalous phonons in {C}a{F}e 2 {A}s 2 explored by
                      inelastic neutron scattering3},
      journal      = {Journal of physics / Conference Series},
      volume       = {251},
      issn         = {1742-6596},
      address      = {Bristol},
      publisher    = {IOP Publ.},
      reportid     = {FZJ-2017-06677},
      pages        = {012008 -},
      year         = {2010},
      abstract     = {Extensive inelastic neutron scattering measurements of
                      phonons on a single crystal of CaFe2As2 allowed us to
                      establish a fairly complete picture of phonon dispersions in
                      the main symmetry directions. The phonon spectra were also
                      calculated by density functional theory (DFT) in the local
                      density approximation (LDA). There are serious discrepancies
                      between calculations done for the optimized structure and
                      experiment, because the optimised structure is not the
                      ambient pressure structure but is very close to the
                      "collapsed" structure reached at p = 3.5 kbar. However, if
                      the experimental crystal structure is used the calculation
                      gives correct frequencies of most phonons. The most
                      important new result is that linewidths/frequencies of
                      certain modes are larger/softer than predicted by DFT-LDA.
                      We also observed strong temperature dependence of some
                      phonons near the structural phase transition near 172 K.
                      This behavior may indicate anomalously strong electron
                      phonon coupling and/or anharmonicity, which may be important
                      to the mechanism of superconductivity.},
      cin          = {JCNS-2 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / PGI-4 / JARA-FIT},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)PGI-4-20110106 / $I:(DE-82)080009_20140620$},
      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},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000291982100008},
      doi          = {10.1088/1742-6596/251/1/012008},
      url          = {https://juser.fz-juelich.de/record/837907},
}