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@ARTICLE{Zbiri:843943,
      author       = {Zbiri, Mohamed and Jin, Wentao and Xiao, Yinguo and Sun,
                      Yunlei and Su, Yixi and Demirdis, Sultan and Cao, Guanghan},
      title        = {{A}bsence of magnetism in the superconductor {B} a 2 {T} i
                      2 {F} e 2 {A} s 4 {O} : {I}nsights from inelastic neutron
                      scattering measurements and ab initio calculations of phonon
                      spectra},
      journal      = {Physical review / B},
      volume       = {95},
      number       = {17},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-01466},
      pages        = {174301},
      year         = {2017},
      abstract     = {Ba2Ti2Fe2As4O is a self-doped superconductor exhibiting a
                      Tc∼21.5K and containing, distinctively with respect to
                      other Fe-based superconductors, not only [Fe2As2] layers but
                      also conducting [Ti2O] sheets. This compound exhibits a
                      transition at T∗∼125K, which has tentatively been
                      assigned in the literature to a possible density-wave order.
                      However, the nature of this density wave (whether it is
                      charge- or spin-induced) is still under debate. Magnetism in
                      Ba2Ti2Fe2As4O has never been experimentally confirmed, which
                      raises the question whether this superconductor might be
                      nonmagnetic or exhibiting a very weak magnetism. Here, we
                      report evidence from inelastic neutron scattering (INS)
                      measurements and ab initio calculations of phonon spectra
                      pointing towards a possible absence of magnetism in
                      Ba2Ti2Fe2As4O. The INS measurements did not reveal any
                      noticeable magnetic effects in Ba2Ti2Fe2As4O, within the
                      accessible (Q, E) space. The effect of magnetism on
                      describing phonon spectra was further investigated by
                      performing ab initio calculations. In this context,
                      nonmagnetic calculations reproduced well the measured phonon
                      spectra. Therefore, our results indicate a nonmagnetic
                      character of the superconductor Ba2Ti2Fe2As4O.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2 / Neutronenstreuung ;
                      JCNS-1},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)JCNS-1-20110106},
      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)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000400659400001},
      doi          = {10.1103/PhysRevB.95.174301},
      url          = {https://juser.fz-juelich.de/record/843943},
}