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@ARTICLE{Song:841176,
      author       = {Song, Yu and Wang, Weiyi and Zhang, Chenglin and Gu,
                      Yanhong and Lu, Xingye and Tan, Guotai and Su, Yixi and
                      Bourdarot, Frédéric and Christianson, A. D. and Li,
                      Shiliang and Dai, Pengcheng},
      title        = {{T}emperature and polarization dependence of low-energy
                      magnetic fluctuations in nearly optimally doped
                      {N}a{F}e$_{0.9785}${C}o$_{0.0215}${A}s},
      journal      = {Physical review / B},
      volume       = {96},
      number       = {18},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2017-08272},
      pages        = {184512},
      year         = {2017},
      abstract     = {We use unpolarized and polarized neutron scattering to
                      study the temperature and polarization dependence of
                      low-energy magnetic fluctuations in nearly optimally doped
                      NaFe0.9785Co0.0215As, with coexisting superconductivity
                      (Tc≈19 K) and weak antiferromagnetic order (TN≈30 K,
                      ordered moment ≈0.02μB/Fe). A single spin resonance mode
                      with intensity tracking the superconducting order parameter
                      is observed, although energy of the mode only softens
                      slightly upon approaching Tc. Polarized neutron scattering
                      reveals that the single resonance is mostly isotropic in
                      spin space, similar to overdoped NaFe0.935Co0.045As but
                      different from optimal electron-, hole-, and isovalently
                      doped BaFe2As2 compounds, all featuring an additional
                      prominent anisotropic component. Spin anisotropy in
                      NaFe0.9785Co0.0215As is instead present at energies below
                      the resonance, which becomes partially gapped below Tc,
                      similar to the situation in optimally doped YBa2Cu3O6.9. Our
                      results indicate that anisotropic spin fluctuations in
                      NaFe1−xCoxAs appear in the form of a resonance in the
                      underdoped regime, become partially gapped below Tc near
                      optimal doping, and disappear in overdoped compounds.},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      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)NOSPEC-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000415086200006},
      doi          = {10.1103/PhysRevB.96.184512},
      url          = {https://juser.fz-juelich.de/record/841176},
}