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@ARTICLE{Stock:15736,
      author       = {Stock, C. and Chapon, L.C. and Schneidewind, A. and Su, Y.
                      and Radaelli, P.G. and McMorrow, D.F. and Bombardi, A. and
                      Lee, N. and Cheong, S.-W.},
      title        = {{H}elical spin-waves, magnetic order, and fluctuations in
                      the langasite compound {B}a3{N}b{F}e3{S}i2014},
      journal      = {Physical review / B},
      volume       = {83},
      number       = {10},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-15736},
      pages        = {104426},
      year         = {2011},
      note         = {We are grateful to A. Orszulik (ISIS) and H. Schneider
                      (JCNS) for expert technical support throughout the
                      experiments and to R. Coldea and R. Cowley for helpful
                      discussions. We are indebted to J. Jensen for very helpful
                      comments and suggestions. We are also grateful for grants
                      from the EU-NMI3 Access Program for partial funding of this
                      research. The work at Rugers was supported by the National
                      Research Foundation of Korea (Grant No.
                      KRF-2008-220-C00012).},
      abstract     = {We have investigated spin fluctuations in the langasite
                      compound Ba3NbFe3Si2O14 both in the ordered state and as a
                      function of temperature. The low-temperature magnetic
                      structure is defined by a spiral phase characterized by
                      magnetic Bragg peaks at (q) over right arrow = (0,0,tau
                      similar to 1/7) onset at T-N = 27 K as previously reported
                      by Marty et al. [Phys. Rev. Lett. 101, 247201 (2008)]. The
                      nature of the fluctuations and temperature dependence of the
                      order parameter is consistent with a classical second-order
                      phase transition for a two-dimensional triangular
                      antiferromagnet. We show that the physical properties and
                      energy scales including the ordering wave vector,
                      Curie-Weiss temperature, and spin waves can be explained
                      through the use of only symmetric exchange constants without
                      the need for a dominant Dzyaloshinskii-Moriya interaction.
                      This is accomplished through a set of "helical" exchange
                      pathways along the c direction imposed by the chiral crystal
                      structure and naturally explains the magnetic diffuse
                      scattering, which displays a strong vector chirality up to
                      high temperatures, well above the ordering temperature. This
                      illustrates a strong coupling between magnetic and
                      crystalline chirality in this compound.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JCNS (München) ; Jülich Centre for Neutron
                      Science JCNS (München) ; JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-4-20110106 /
                      I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)DNS-20140101 / EXP:(DE-MLZ)PANDA-20140101},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000288945400005},
      doi          = {10.1103/PhysRevB.83.104426},
      url          = {https://juser.fz-juelich.de/record/15736},
}