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@ARTICLE{Zhang:172056,
      author       = {Zhang, Chenglin and Song, Yu and Regnault, L.-P. and Su,
                      Yixi and Enderle, M. and Kulda, J. and Tan, Guotai and Sims,
                      Zachary C. and Egami, Takeshi and Si, Qimiao and Dai,
                      Pengcheng},
      title        = {{A}nisotropic neutron spin resonance in underdoped
                      superconducting
                      ${\mathrm{{N}a{F}e}}_{1-x}{\mathrm{{C}o}}_{x}\mathrm{{A}s}$},
      journal      = {Physical review / B},
      volume       = {90},
      number       = {14},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2014-05605},
      pages        = {140502},
      year         = {2014},
      abstract     = {We use polarized inelastic neutron scattering (INS) to
                      study spin excitations in superconducting NaFe0.985Co0.015As
                      (C15) with static antiferromagnetic (AF) order along the a
                      axis of the orthorhombic structure and NaFe0.935Co0.045As
                      (C45) without AF order. In previous unpolarized INS work,
                      spin excitations in C15 were found to have a dispersive
                      sharp resonance near Er1=3.25 meV and a broad dispersionless
                      mode at Er2=6 meV. Our neutron polarization analysis reveals
                      that the dispersive resonance in C15 is highly anisotropic
                      and polarized along the a and c axes, while the
                      dispersionless mode is isotropic similar to that of C45.
                      Since the a-axis polarized spin excitations of the
                      anisotropic resonance appear below Tc, our data suggests
                      that the itinerant electrons contributing to the magnetism
                      are also coupled to the superconductivity.},
      cin          = {JCNS-2 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {544 - In-house Research with PNI (POF2-544) / 424 -
                      Exploratory materials and phenomena (POF2-424) / 54G - JCNS
                      (POF2-54G24)},
      pid          = {G:(DE-HGF)POF2-544 / G:(DE-HGF)POF2-424 /
                      G:(DE-HGF)POF2-54G24},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000344017500002},
      doi          = {10.1103/PhysRevB.90.140502},
      url          = {https://juser.fz-juelich.de/record/172056},
}