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@ARTICLE{Wimmer:902581,
      author       = {Wimmer, Stefan and Sánchez-Barriga, Jaime and Küppers,
                      Philipp and Ney, Andreas and Schierle, Enrico and Freyse,
                      Friedrich and Caha, Ondrej and Michalička, Jan and
                      Liebmann, Marcus and Primetzhofer, Daniel and Hoffman,
                      Martin and Ernst, Arthur and Otrokov, Mikhail M. and
                      Bihlmayer, Gustav and Weschke, Eugen and Lake, Bella and
                      Chulkov, Evgueni V. and Morgenstern, Markus and Bauer,
                      Günther and Springholz, Gunther and Rader, Oliver},
      title        = {{M}n‐{R}ich {M}n{S}b 2 {T}e 4 : {A} {T}opological
                      {I}nsulator with {M}agnetic {G}ap {C}losing at {H}igh
                      {C}urie {T}emperatures of 45–50 {K}},
      journal      = {Advanced materials},
      volume       = {33},
      number       = {42},
      issn         = {0935-9648},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2021-04380},
      pages        = {2102935},
      year         = {2021},
      abstract     = {Ferromagnetic topological insulators exhibit the quantum
                      anomalous Hall effect, which is potentially useful for
                      high-precision metrology, edge channel spintronics, and
                      topological qubits. The stable 2+ state of Mn enables
                      intrinsic magnetic topological insulators. MnBi2Te4 is,
                      however, antiferromagnetic with 25 K Néel temperature and
                      is strongly n-doped. In this work, p-type MnSb2Te4,
                      previously considered topologically trivial, is shown to be
                      a ferromagnetic topological insulator for a few percent Mn
                      excess. i) Ferromagnetic hysteresis with record Curie
                      temperature of 45–50 K, ii) out-of-plane magnetic
                      anisotropy, iii) a 2D Dirac cone with the Dirac point close
                      to the Fermi level, iv) out-of-plane spin polarization as
                      revealed by photoelectron spectroscopy, and v) a
                      magnetically induced bandgap closing at the Curie
                      temperature, demonstrated by scanning tunneling spectroscopy
                      (STS), are shown. Moreover, a critical exponent of the
                      magnetization β ≈ 1 is found, indicating the vicinity of
                      a quantum critical point. Ab initio calculations reveal that
                      Mn–Sb site exchange provides the ferromagnetic interlayer
                      coupling and the slight excess of Mn nearly doubles the
                      Curie temperature. Remaining deviations from the
                      ferromagnetic order open the inverted bulk bandgap and
                      render MnSb2Te4 a robust topological insulator and new
                      benchmark for magnetic topological insulators.},
      cin          = {PGI-1 / IAS-1 / JARA-FIT / JARA-HPC},
      ddc          = {660},
      cid          = {I:(DE-Juel1)PGI-1-20110106 / I:(DE-Juel1)IAS-1-20090406 /
                      $I:(DE-82)080009_20140620$ / $I:(DE-82)080012_20140620$},
      pnm          = {5211 - Topological Matter (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5211},
      typ          = {PUB:(DE-HGF)16},
      pubmed       = {pmid:34469013},
      UT           = {WOS:000691903200001},
      doi          = {10.1002/adma.202102935},
      url          = {https://juser.fz-juelich.de/record/902581},
}