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@INPROCEEDINGS{Zorn:1023109,
      author       = {Zorn, Reiner and Chua, Yeong Zen and Schmelzer, Jürn W. P.
                      and Schick, Christoph and Holderer, Olaf and Zamponi,
                      Michaela},
      title        = {{D}etermination of the cooperativity length in glass
                      forming liquids and polymers},
      reportid     = {FZJ-2024-01679},
      year         = {2022},
      abstract     = {Although the idea of a ‘cooperativity’ length scale ξ
                      related to the glass transition is now wide-spread, there is
                      much less consensus on whether this length scale can be
                      related to thermodynamic fluctuations and, if yes, whether
                      one has to consider temperature fluctuations δT. The
                      crucial experiment to this end has to compare values of ξ
                      from ‘thermodynamic’ formulae to independent values from
                      structural-dynamics experiments.In a seminal paper, Ernst
                      Donth proposed to assign a length scale to the
                      AC-calorimetric relaxation time using the spatial resolution
                      of quasielastic neutron scattering. The main problem is to
                      find a range of relaxation times that is accessible by both
                      methods. To achieve this, significant progress in the
                      performance of NSE as well as AC calorimetry was required.A
                      first experiment of this kind was realised on a
                      glass-forming liquid, propylene glycol (PG). The result was
                      that agreement with the thermodynamic calculations was
                      better if temperature fluctuations were accounted for.
                      Nevertheless, in PG the difference between the two
                      thermodynamic estimates is small. Therefore, a material with
                      a higher ‘contrast’ between the alternatives was used in
                      a second experiment, poly(ethylmethacrylate) (PEMA). In
                      addition, this experiment benefitted from the upgrade of
                      J-NSE with superconducting coils. The new results show a
                      clear agreement with the thermodynamic calculation involving
                      temperature fluctuations.},
      month         = {Dec},
      date          = {2022-12-08},
      organization  = {MLZ User Meeting 2022, München
                       (Germany), 8 Dec 2022 - 9 Dec 2022},
      subtyp        = {Invited},
      cin          = {JCNS-1 / IBI-8},
      cid          = {I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)IBI-8-20200312},
      pnm          = {623 - Data Management and Analysis (POF4-623) / 6G4 -
                      Jülich Centre for Neutron Research (JCNS) (FZJ) (POF4-6G4)
                      / 5251 - Multilevel Brain Organization and Variability
                      (POF4-525) / 5241 - Molecular Information Processing in
                      Cellular Systems (POF4-524)},
      pid          = {G:(DE-HGF)POF4-623 / G:(DE-HGF)POF4-6G4 /
                      G:(DE-HGF)POF4-5251 / G:(DE-HGF)POF4-5241},
      experiment   = {EXP:(DE-MLZ)J-NSE-20140101 / EXP:(DE-MLZ)SPHERES-20140101},
      typ          = {PUB:(DE-HGF)6},
      url          = {https://juser.fz-juelich.de/record/1023109},
}