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@ARTICLE{Tcakaev:453867,
      author       = {Tcakaev, A. and Zabolotnyy, V. B. and Fornari, C. I. and
                      Rüßmann, P. and Peixoto, T. R. F. and Stier, Fabian and
                      Dettbarn, M. and Kagerer, Philipp 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     = {PUBDB-2021-00231},
      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 Bi$_2$Te$_3$ 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
                      M$_{4,5}$ x-ray absorption and magnetic circular dichroism
                      spectra reveals a Eu$^{2+}$ valence and confirms a large
                      magnetic moment, consistent with a 4$f^7$$^8S$$_{7/2}$
                      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
                      Bi$_2$Te$_3$ and call for spectroscopic studies in the
                      Kelvin range to look for novel quantum phenomena such as the
                      quantum anomalous Hall effect.},
      cin          = {DOOR ; HAS-User},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731},
      pnm          = {6G3 - PETRA III (POF3-622) / FS-Proposal: I-20181060
                      (I-20181060) / DFG project 390534769 - EXC 2004: Materie und
                      Licht für Quanteninformation (ML4Q) (390534769) / DFG
                      project 390858490 - EXC 2147: Komplexität und Topologie in
                      Quantenmaterialien (CT.QMAT) (390858490)},
      pid          = {G:(DE-HGF)POF3-6G3 / G:(DE-H253)I-20181060 /
                      G:(GEPRIS)390534769 / G:(GEPRIS)390858490},
      experiment   = {EXP:(DE-H253)P-P04-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000583633100005},
      doi          = {10.1103/PhysRevB.102.184401},
      url          = {https://bib-pubdb1.desy.de/record/453867},
}