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@ARTICLE{Song:843942,
      author       = {Song, Yu and Lu, Xingye and Regnault, L.-P. and Su, Yixi
                      and Lai, Hsin-Hua and Hu, Wen-Jun and Si, Qimiao and Dai,
                      Pengcheng},
      title        = {{S}pin-isotropic continuum of spin excitations in
                      antiferromagnetically ordered {F}e 1.07 {T}e},
      journal      = {Physical review / B},
      volume       = {97},
      number       = {2},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2018-01465},
      pages        = {024519},
      year         = {2018},
      abstract     = {Unconventional superconductivity typically emerges in the
                      presence of quasidegenerate ground states, and the
                      associated intense fluctuations are likely responsible for
                      generating the superconducting state. Here we use polarized
                      neutron scattering to study the spin space anisotropy of
                      spin excitations in Fe1.07Te exhibiting bicollinear
                      antiferromagnetic (AF) order, the parent compound of
                      FeTe1−xSex superconductors. We confirm that the low-energy
                      spin excitations are transverse spin waves, consistent with
                      a local-moment origin of the bicollinear AF order. While the
                      ordered moments lie in the ab plane in Fe1.07Te, it takes
                      less energy for them to fluctuate out of plane, similar to
                      BaFe2As2 and NaFeAs. At energies above E≳20 meV, we find
                      magnetic scattering to be dominated by an isotropic
                      continuum that persists up to at least 50 meV. Although the
                      isotropic spin excitations cannot be ascribed to spin waves
                      from a long-range-ordered local-moment antiferromagnet, the
                      continuum can result from the bicollinear magnetic order
                      ground state of Fe1.07Te being quasidegenerate with
                      plaquette magnetic order.},
      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)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000423656400005},
      doi          = {10.1103/PhysRevB.97.024519},
      url          = {https://juser.fz-juelich.de/record/843942},
}