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@ARTICLE{MartnezGalera:256626,
      author       = {Martínez-Galera, A. J. and Schröder, U. A. and Huttmann,
                      F. and Jolie, W. and Craes, F. and Busse, C. and Caciuc, V.
                      and Atodiresei, N. and Blügel, S. and Michely, T.},
      title        = {{O}xygen orders differently under graphene: new
                      superstructures on {I}r(111)},
      journal      = {Nanoscale},
      volume       = {8},
      number       = {4},
      issn         = {2040-3372},
      address      = {Cambridge},
      publisher    = {RSC Publ.},
      reportid     = {FZJ-2015-06489},
      pages        = {1932-1943},
      year         = {2016},
      abstract     = {Using scanning tunneling microscopy, the oxygen adsorbate
                      superstructures on bare Ir(111) are identified and compared
                      to the ones formed by intercalation in between graphene and
                      the Ir(111) substrate. For bare Ir(111) we observe O-(2 ×
                      2) and O-(2 × 1) structures, thereby clarifying a
                      persistent uncertainty about the existence of these
                      structures and the role of defects for their stability. For
                      the case of graphene-covered Ir(111), oxygen intercalation
                      superstructures can be imaged through the graphene monolayer
                      by choosing proper tunneling conditions. Depending on the
                      pressure, temperature and duration of O2 exposure as well as
                      on the graphene morphology, O-(2 × 2),
                      O-(√3×√3)-R30°, O-(2 × 1) and O-(2√3 ×
                      2√3)-R30° superstructures with respect to Ir(111) are
                      observed under the graphene cover. Two of these structures,
                      the O-(√3 × √3)-R30° and the (2√3 × 2√3)-R30°
                      structure are only observed when the graphene layer is on
                      top. Phase coexistence and formation conditions of the
                      intercalation structures between graphene and Ir(111) are
                      analyzed. The experimental results are compared to density
                      functional theory calculations including dispersive forces.
                      The existence of these phases under graphene and their
                      absence on bare Ir(111) are discussed in terms of possible
                      changes in the adsorbate-substrate interaction due to the
                      presence of the graphene cover.},
      cin          = {IAS-1 / PGI-1 / JARA-FIT},
      ddc          = {600},
      cid          = {I:(DE-Juel1)IAS-1-20090406 / I:(DE-Juel1)PGI-1-20110106 /
                      $I:(DE-82)080009_20140620$},
      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:000368860900021},
      doi          = {10.1039/C5NR04976H},
      url          = {https://juser.fz-juelich.de/record/256626},
}