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@ARTICLE{Niklowitz:874253,
      author       = {Niklowitz, P. G. and Hirschberger, M. and Lucas, M. and
                      Cermak, P. and Schneidewind, A. and Faulhaber, E. and
                      Mignot, J.-M. and Duncan, W. J. and Neubauer, A. and
                      Pfleiderer, C. and Grosche, F. M.},
      title        = {{U}ltrasmall {M}oment {I}ncommensurate {S}pin {D}ensity
                      {W}ave {O}rder {M}asking a {F}erromagnetic {Q}uantum
                      {C}ritical {P}oint in {N}b{F}e 2},
      journal      = {Physical review letters},
      volume       = {123},
      number       = {24},
      issn         = {1079-7114},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {FZJ-2020-01344},
      pages        = {247203},
      year         = {2019},
      abstract     = {In the metallic magnet Nb1−yFe2þy, the low temperature
                      threshold of ferromagnetism can be investigatedby varying
                      the Fe excessywithin a narrow homogeneity range. We use
                      elastic neutron scattering to trackthe evolution of magnetic
                      order from Fe-rich, ferromagnetic Nb0.981Fe2.019to
                      approximately stoichiometricNbFe2, in which we can, for the
                      first time, characterize a long-wavelength spin density wave
                      state burying aferromagnetic quantum critical point. The
                      associated ordering wave vectorqSDW¼ð0;0;lSDWÞis found
                      todepend significantly onyandT, staying finite but
                      decreasing as the ferromagnetic state is approached.
                      Thephase diagram follows a two-order-parameter Landau
                      theory, for which all of the coefficients can now
                      bedetermined. Our findings suggest that the emergence of
                      spin density wave order cannot be attributed toband
                      structure effects alone. They indicate a common microscopic
                      origin of both types of magnetic orderand provide strong
                      constraints on related theoretical scenarios based on, e.g.,
                      quantum order by disorder.},
      cin          = {JCNS-FRM-II / JCNS-2},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623) / 6G15 - FRM II / MLZ
                      (POF3-6G15)},
      pid          = {G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6G4 /
                      G:(DE-HGF)POF3-6G15},
      experiment   = {EXP:(DE-MLZ)PANDA-20140101},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:31922868},
      UT           = {WOS:000502130400008},
      doi          = {10.1103/PhysRevLett.123.247203},
      url          = {https://juser.fz-juelich.de/record/874253},
}