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@ARTICLE{Stellhorn:454447,
      author       = {Stellhorn, Jens and Paulus, Benedict and Hosokawa, Shinya
                      and Pilgrim, Wolf-Christian and Boudet, Nathalie and Blanc,
                      Nils and Ikemoto, Hiroyuki and Kohara, Shinji and Sutou,
                      Yuji},
      title        = {{S}tructure of amorphous {C}u$_2${G}e{T}e$_3$ and the
                      implications for its phase-change properties},
      journal      = {Physical review / B},
      volume       = {101},
      number       = {21},
      issn         = {2469-9950},
      address      = {Woodbury, NY},
      publisher    = {Inst.},
      reportid     = {PUBDB-2021-00521},
      pages        = {214110},
      year         = {2020},
      abstract     = {The structure of amorphous Cu$_2$GeTe$_3$ is investigated
                      by a combination of anomalous x-ray scattering and extended
                      x-ray absorption fine-structure experiments. The
                      experimental data are analyzed with reverse Monte Carlo
                      modeling, and they are interpreted in terms of
                      short-range-order parameters as well as by using ring
                      statistics and persistent homology to study the
                      intermediate-range order. Based on this information, the
                      structural relationship of the amorphous phase to the
                      corresponding crystal is discussed. It is found that the
                      amorphous network can be rationalized by small atomic
                      displacements of the crystal structure, directed toward the
                      intrinsic void regions. This structural similarity
                      establishes the possibility of a fast phase-change process.
                      On the other hand, the atomic rearrangements also lead to
                      the formation of new chemical bonds and to distortions on
                      the intermediate-range-order level. These are realized by a
                      collapse and contraction of the strict hexagonal ring
                      arrangements of the crystal and by the formation of small,
                      triangular rings as well as Cu cluster configurations. These
                      structural features allow for a new understanding of the
                      phase-change property contrast of this material, especially
                      concerning the density change and the optical contrast.},
      cin          = {FS-PS},
      ddc          = {530},
      cid          = {I:(DE-H253)FS-PS-20131107},
      pnm          = {6212 - Quantum Condensed Matter: Magnetism,
                      Superconductivity (POF3-621)},
      pid          = {G:(DE-HGF)POF3-6212},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000542919400001},
      doi          = {10.1103/PhysRevB.101.214110},
      url          = {https://bib-pubdb1.desy.de/record/454447},
}