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@INPROCEEDINGS{Wuttke:189036,
      author       = {Wuttke, Joachim and Bellissent-Funel, Marie-Claire and
                      Kaneko, Katsumi and Ohba, Tomonori and Appavou, Marie-Sousai
                      and Soininen, Antti},
      title        = {{T}he unimpressive origin of the apparent fragile-strong
                      transition.},
      reportid     = {FZJ-2015-02293},
      year         = {2015},
      abstract     = {Supercooled water is suspected to undergo a fragile-strong
                      transition (FST).Theoretical interest has been fostered by a
                      possible connection with a Widomline emanating from the
                      phase boundary between low and high densityamorphous ice.
                      Experimental support for the FST has mostly come from
                      high-resolution neutron spectroscopy. The FST appears as a
                      kink in the temperaturedependence of a mean relaxation time
                      <τ>. This interpretation depends criticallyon the
                      assumption that the experiment sees one and the same
                      relaxationprocess above and below the kink. Based on new
                      backscattering spectra ofwater in carbon nanohorns we show
                      that the contrary is the case.Formally, our fit function is
                      the same as regularly used in support of a FST: a sumof a
                      delta line, accounting for elastic scattering by the matrix,
                      and a Kohlrauschspectrum. This model suffers from parameter
                      degeneracies. Occam's razor tellsus to maximize constraints
                      under minimal physical assumptions. We useharmonic
                      extrapolations of the T dependent scattering intensity to
                      fix theamplitudes in our delta-plus-Kohlrausch fits. We then
                      identify two q,T regions thatadmit particularly stringent
                      constraints, and a crossover regime in between. Inthis way,
                      we find that quasielastic scattering reveals different
                      physics in differentq,T regimes: At low T, it is dominated
                      by localized motion; at high T by relaxation-coupled
                      diffusion.},
      month         = {Mar},
      date          = {2015-03-22},
      organization  = {XIV International Workshop on Complex
                       Systems., Fai della Paganella (Italy),
                       22 Mar 2015 - 25 Mar 2015},
      subtyp        = {Plenary/Keynote},
      cin          = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
                      (München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1},
      cid          = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
                      I:(DE-Juel1)JCNS-1-20110106},
      pnm          = {6215 - Soft Matter, Health and Life Sciences (POF3-621) /
                      6G15 - FRM II / MLZ (POF3-6G15) / 6G4 - Jülich Centre for
                      Neutron Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-6215 / G:(DE-HGF)POF3-6G15 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-MLZ)SPHERES-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/189036},
}