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@ARTICLE{Lin:1041606,
      author       = {Lin, You-Ron and Bagchi, Mahasweta and Soubatch, Serguei
                      and Lee, Tien-Lin and Brede, Jens and Bocquet, François C.
                      and Kumpf, Christian and Ando, Yoichi and Tautz, F. Stefan},
      title        = {{T}he {V}ertical {P}osition of {S}r {D}opants in the
                      {S}r$_x${B}i$_2${S}e$_3$ {S}uperconductor},
      publisher    = {arXiv},
      reportid     = {FZJ-2025-02340},
      year         = {2021},
      abstract     = {The discovery of topological superconductivity in doped
                      Bi$_2$Se$_3$ made this class of materials highly important
                      for the field of condensed matter physics. However, the
                      structural origin of the superconducting state remained
                      elusive, despite being investigated intensively in recent
                      years. We use scanning tunneling microscopy and the normal
                      incidence x-ray standing wave (NIXSW) technique in order to
                      determine the vertical position of the dopants -- one of the
                      key parameters for understanding topological
                      superconductivity in this material -- for the case of
                      Sr$_{x}$Bi$_2$Se$_3$. In a novel approach we analyze the
                      NIXSW data in consideration of the inelastic mean free path
                      of the photoemitted electrons, which allows us to
                      distinguish between symmetry equivalent sites. We find that
                      Sr-atoms are not situated inside the van der Waals gap
                      between the Bi$_2$Se$_3$ quintuple layers but rather in the
                      quintuple layer close to the outer Se planes.},
      keywords     = {Superconductivity (cond-mat.supr-con) (Other) / Materials
                      Science (cond-mat.mtrl-sci) (Other) / FOS: Physical sciences
                      (Other)},
      cin          = {PGI-3},
      cid          = {I:(DE-Juel1)PGI-3-20110106},
      pnm          = {5213 - Quantum Nanoscience (POF4-521)},
      pid          = {G:(DE-HGF)POF4-5213},
      typ          = {PUB:(DE-HGF)25},
      doi          = {10.48550/ARXIV.2105.14904},
      url          = {https://juser.fz-juelich.de/record/1041606},
}