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@ARTICLE{Pries:907839,
      author       = {Pries, Julian and Weber, Hans and Benke-Jacob, Julia and
                      Kaban, Ivan and Wei, Shuai and Wuttig, Matthias and Lucas,
                      Pierre},
      title        = {{F}ragile-to-{S}trong {T}ransition in {P}hase-{C}hange
                      {M}aterial {G}e3{S}b6{T}e5},
      journal      = {Advanced functional materials},
      volume       = {32},
      number       = {31},
      issn         = {1057-9257},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {FZJ-2022-02238},
      pages        = {2202714 -},
      year         = {2022},
      abstract     = {Chalcogenide phase-change materials combine a remarkable
                      set of properties that makes them promising candidates for
                      future non-volatile memory applications. Binary data storage
                      exploits the high contrast in electrical and optical
                      properties between the covalent amorphous and metavalent
                      crystalline phase. Here the authors perform an analysis of
                      the liquid phase kinetics of the phase-change material
                      Ge3Sb6Te5, which is the key to ultrafast switching speeds.
                      By employing four experimental techniques, the viscosity is
                      measured over sixteen orders of magnitude despite its
                      propensity for fast crystallization. These measurements
                      reveal that the liquid undergoes a transition in
                      viscosity–temperature dependence associated with a
                      liquid–liquid phase transition. The system exhibits a
                      shallow viscosity change with temperature near the glass
                      transition which stabilizes the memory cells in the
                      amorphous state and which limits the severity of relaxation
                      processes. Meanwhile, when heated during the writing
                      process, the fragility increases to more than double,
                      causing the viscosity to drop rapidly enabling a nanosecond
                      crystallization speed. This change in
                      viscosity–temperature dependence is highly unusual among
                      glass forming liquids and is reminiscent of the behavior of
                      water. This viscosity transition is also key to the
                      technological success of phase-change materials for computer
                      memory applications.},
      cin          = {PGI-10},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-10-20170113},
      pnm          = {5233 - Memristive Materials and Devices (POF4-523)},
      pid          = {G:(DE-HGF)POF4-5233},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000794043200001},
      doi          = {10.1002/adfm.202202714},
      url          = {https://juser.fz-juelich.de/record/907839},
}