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@ARTICLE{Richter:168378,
      author       = {Richter, Carsten and Novikov, Dmitri and Mukhamedzhanov,
                      Enver and Borisov, M. M. and Akimova, K. A. and
                      Ovchinnikova, Elena and Oreshko, Alexey and Strempfer, Joerg
                      and Zschornak, Matthias and Mehner, Erik and Meyer, Dirk C.
                      and Dmitrienko, V. E.},
      title        = {{M}echanisms of the paraelectric to ferroelectric phase
                      transition in ${R}b{H}_{2}{PO}_{4}$ probed by purely
                      resonant x-ray diffraction},
      journal      = {Physical review / B},
      volume       = {89},
      number       = {9},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {DESY-2014-02519},
      pages        = {094110},
      year         = {2014},
      abstract     = {Resonant x-ray diffraction was used to study the proton
                      jumps in hydrogen-bonded rubidium dihydrogen phosphate (RDP)
                      crystals. In the paraelectric RDP phase, hydrogen is
                      delocalized between two crystallographically equivalent
                      positions. At lower temperatures, this symmetry can be
                      broken, which defines the processes that lead to the para-
                      to ferroelectric phase transition. We have measured the
                      energy spectra of the forbidden reflections 006 and 550 at
                      incident radiation energies close to the Rb K edge in a wide
                      temperature range, down to the temperature of the
                      ferroelectric phase transition. In the paraelectric phase,
                      we observed a growth of integrated intensity for both
                      forbidden reflections with temperature. This behavior is
                      opposite to conventional nonresonant Bragg reflections,
                      where intensity decreases in accordance with the
                      Debye-Waller factor. The developed theoretical model
                      explains this effect with the thermal motion induced (TMI)
                      scattering mechanism and also confirms the adiabatic
                      approximation stating that electrons instantly follow the
                      nuclei movements. In the 550 energy spectra, we have
                      observed an additional contribution to the resonant
                      structure factor, which could be associated with the
                      presence of transient Slater-type proton configurations (PC)
                      in the half-filled hydrogen position.},
      cin          = {TUFreib / FS-PE / FS-PEX},
      ddc          = {530},
      cid          = {I:(DE-H253)TUFreib-20120814 / I:(DE-H253)FS-PE-20120731 /
                      I:(DE-H253)FS-PEX-20130206},
      pnm          = {PETRA Beamline P09 (POF2-54G14) / DORIS Beamline D3
                      (POF2-54G13)},
      pid          = {G:(DE-H253)POF2-P09-20130405 / G:(DE-H253)POF2-D3-20130405},
      experiment   = {EXP:(DE-H253)P-P09-20150101 / EXP:(DE-H253)D-D3-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000333447600001},
      doi          = {10.1103/PhysRevB.89.094110},
      url          = {https://bib-pubdb1.desy.de/record/168378},
}