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@ARTICLE{Waer:867567,
      author       = {Waßer, Florian and Park, Jitae T. and Aswartham, Saicharan
                      and Wurmehl, Sabine and Sidis, Yvan and Steffens, Paul and
                      Schmalzl, Karin and Büchner, Bernd and Braden, Markus},
      title        = {{S}trong spin resonance mode associated with suppression of
                      soft magnetic ordering in hole-doped {B}a1-x{N}ax{F}e2{A}s2},
      journal      = {npj quantum materials},
      volume       = {4},
      number       = {1},
      issn         = {2397-4648},
      address      = {[London]},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2019-06190},
      pages        = {59},
      year         = {2019},
      abstract     = {Spin-resonance modes (SRM) are taken as evidence for
                      magnetically driven pairing in Fe-based superconductors, but
                      their character remains poorly understood. The broadness,
                      the splitting and the spin-space anisotropies of SRMs
                      contrast with the mostly accepted interpretation as spin
                      excitons. We study hole-doped Ba1−xNaxFe2As2 that displays
                      a spin reorientation transition. This reorientation has
                      little impact on the overall appearance of the resonance
                      excitations with a high-energy isotropic and a low-energy
                      anisotropic mode. However, the strength of the anisotropic
                      low-energy mode sharply peaks at the highest doping that
                      still exhibits magnetic ordering resulting in the strongest
                      SRM observed in any Fe-based superconductor so far. This
                      remarkably strong SRM is accompanied by a loss of about half
                      of the magnetic Bragg intensity upon entering the SC phase.
                      Anisotropic SRMs thus can allow the system to compensate for
                      the loss of exchange energy arising from the reduced
                      antiferromagnetic correlations within the SC state.},
      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},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000502294600001},
      doi          = {10.1038/s41535-019-0198-4},
      url          = {https://juser.fz-juelich.de/record/867567},
}