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@ARTICLE{Tcakaev:888890,
      author       = {Tcakaev, A. and Zabolotnyy, V. B. and Fornari, C. I. and
                      Rüßmann, P. and Peixoto, T. R. F. and Stier, F. and
                      Dettbarn, M. and Kagerer, P. and Weschke, E. and Schierle,
                      E. and Bencok, P. and Rappl, P. H. O. and Abramof, E. and
                      Bentmann, H. and Goering, E. and Reinert, F. and Hinkov, V.},
      title        = {{I}ncipient antiferromagnetism in the {E}u-doped
                      topological insulator {B}i 2 {T}e 3},
      journal      = {Physical review / B},
      volume       = {102},
      number       = {18},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {FZJ-2020-05295},
      pages        = {184401},
      year         = {2020},
      abstract     = {Rare-earth ions typically exhibit larger magnetic moments
                      than transition-metal ions and thus promise the opening of a
                      wider exchange gap in the Dirac surface states of
                      topological insulators. Yet in a recent photoemission study
                      of Eu-doped Bi2Te3 films, the spectra remained gapless down
                      to T=20 K. Here we scrutinize whether the conditions for a
                      substantial gap formation in this system are present by
                      combining spectroscopic and bulk characterization methods
                      with theoretical calculations. For all studied Eu doping
                      concentrations, our atomic multiplet analysis of the M4,5
                      x-ray absorption and magnetic circular dichroism spectra
                      reveals a Eu2+ valence and confirms a large magnetic moment,
                      consistent with a 4f78S7/2 ground state. At temperatures
                      below 10 K, bulk magnetometry indicates the onset of
                      antiferromagnetic (AFM) ordering. This is in good agreement
                      with density functional theory, which predicts AFM
                      interactions between the Eu impurities. Our results support
                      the notion that antiferromagnetism can coexist with
                      topological surface states in rare-earth-doped Bi2Te3 and
                      call for spectroscopic studies in the Kelvin range to look
                      for novel quantum phenomena such as the quantum anomalous
                      Hall effect.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT / JARA-HPC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {142 - Controlling Spin-Based Phenomena (POF3-142) / 143 -
                      Controlling Configuration-Based Phenomena (POF3-143)},
      pid          = {G:(DE-HGF)POF3-142 / G:(DE-HGF)POF3-143},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000583633100005},
      doi          = {10.1103/PhysRevB.102.184401},
      url          = {https://juser.fz-juelich.de/record/888890},
}