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@ARTICLE{Matsunaga:15486,
      author       = {Matsunaga, T. and Yamada, N. and Kojima, R. and Shamoto, S.
                      and Sato, M. and Tanida, H. and Uruga, T. and Kohara, S. and
                      Takata, M. and Zalden, P. and Bruns, G. and Sergueev, I. and
                      Wille, H. C. and Hermann, R. and Wuttig, M.},
      title        = {{P}hase-{C}hange {M}aterials: {V}ibrational {S}oftening
                      upon {C}rystallization and {I}ts {I}mpact on {T}hermal
                      {P}roperties},
      journal      = {Advanced functional materials},
      volume       = {21},
      issn         = {1616-301X},
      address      = {Weinheim},
      publisher    = {Wiley-VCH},
      reportid     = {PreJuSER-15486},
      pages        = {2232 - 2239},
      year         = {2011},
      note         = {Some synchrotron radiation experiments were performed on
                      BL01B1 and BL02B2 at SPring-8 with the approval of the Japan
                      Synchrotron Radiation Research Institute (JASRI). We express
                      our sincere gratitude to Dr. K. Kato and Dr. K. Osaka at
                      JASRI for their assistance with the experiment. We also
                      express our sincere thanks to Mr. Katsumi Kawahara at
                      Panasonic for his precise preparations of Ge-Sb-Te film
                      samples. The structural model in Figure 4 of the Supporting
                      Information was displayed using Java Structure Viewer (JSV
                      1.08 lite), created by Dr. Steffen Weber. Financial support
                      by the Deutsche Forschungsgemeinschaft (Wu 243/17) and from
                      the Helmholtz Gemeinschaft Deutscher Forschungszentren (RH
                      Young Investigator Group) is gratefully acknowledged. We
                      thank the European Synchrotron Radiation Facility for
                      provision of nuclear inelastic-scattering beamtime at
                      beamline ID22N and Mr. D. Bessas for his assistance during
                      the experiment. A part of this work was supported by Core
                      Research for Evolutional Science and Technology (CREST)
                      "X-ray pinpoint structural measurement project: Development
                      of the spatial-and time-resolved structural study for
                      nano-materials and devices" and by the Academy of Finland
                      and the Japan Science and Technology Agency through the
                      Strategic Japanese-Finnish Cooperative Program on
                      "Functional materials".},
      comment      = {Article first published online: 26 APR 2011},
      booktitle     = {Article first published online: 26 APR
                       2011},
      abstract     = {Crystallization of an amorphous solid is usually
                      accompanied by a significant change of transport properties,
                      such as an increase in thermal and electrical conductivity.
                      This fact underlines the importance of crystalline order for
                      the transport of charge and heat. Phase-change materials,
                      however, reveal a remarkably low thermal conductivity in the
                      crystalline state. The small change in this conductivity
                      upon crystallization points to unique lattice properties.
                      The present investigation reveals that the thermal
                      properties of the amorphous and crystalline state of
                      phase-change materials show remarkable differences such as
                      higher thermal displacements and a more pronounced
                      anharmonic behavior in the crystalline phase. These findings
                      are related to the change of bonding upon crystallization,
                      which leads to an increase of the sound velocity and a
                      softening of the optical phonon modes at the same time.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JARA-FIT / JCNS-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-2-20110106},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
      shelfmark    = {Chemistry, Multidisciplinary / Chemistry, Physical /
                      Nanoscience $\&$ Nanotechnology / Materials Science,
                      Multidisciplinary / Physics, Applied / Physics, Condensed
                      Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000291723300007},
      doi          = {10.1002/adfm.201002274},
      url          = {https://juser.fz-juelich.de/record/15486},
}