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@ARTICLE{Songvilay:865225,
      author       = {Songvilay, M. and Giles-Donovan, N. and Bari, M. and Ye, Z.
                      -G. and Minns, J. L. and Green, M. A. and Xu, Guangyong and
                      Gehring, P. M. and Schmalzl, K. and Ratcliff, W. D. and
                      Brown, C. and Chernyshov, D. and Van Beek, W. and Cochran,
                      S. and Stock, C.},
      title        = {{C}ommon acoustic phonon damping in inorganic and hybrid
                      lead halide perovskites},
      journal      = {Physical review materials},
      volume       = {3},
      issn         = {2475-9953},
      address      = {College Park, MD},
      publisher    = {APS},
      reportid     = {FZJ-2019-04759},
      pages        = {093602},
      year         = {2019},
      abstract     = {The acoustic phonons in the organic-inorganic lead halide
                      perovskites have been reported to have anomalously short
                      lifetimes over a large part of the Brillouin zone. The
                      resulting shortened mean free paths of the phonons have been
                      implicated as the origin of the low thermal conductivity. We
                      apply neutron spectroscopy to show that the same acoustic
                      phonon energy linewidth broadening occurs in the fully
                      inorganic CsPbBr$_{3}$ by comparing the results on the
                      organic-inorganic CH$_{3}$NH$_{3}$PbCl$_{3}$. We investigate
                      the critical dynamics near the three zone boundaries of the
                      cubic $Pm\overline{3}m$ Brillouin zone of CsPbBr$_{3}$ and
                      find energy and momentum broadened dynamics at momentum
                      points where the Cs-site ($A$-site) motions contribute to
                      the cross section. Neutron diffraction is used to confirm
                      that both the Cs and Br sites have unusually large thermal
                      displacements with an anisotropy that mirrors the low
                      temperature structural distortions. The presence of an
                      organic molecule is not necessary to disrupt the low-energy
                      acoustic phonons at momentum transfers located away from the
                      zone center in the lead halide perovskites and such damping
                      may be driven by the large displacements or possibly
                      disorder on the $A$ site.},
      cin          = {JCNS-2 / PGI-4 / JARA-FIT / JCNS-ILL},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JCNS-2-20110106 / I:(DE-Juel1)PGI-4-20110106 /
                      $I:(DE-82)080009_20140620$ / I:(DE-Juel1)JCNS-ILL-20110128},
      pnm          = {144 - Controlling Collective States (POF3-144) / 524 -
                      Controlling Collective States (POF3-524) / 6212 - Quantum
                      Condensed Matter: Magnetism, Superconductivity (POF3-621) /
                      6213 - Materials and Processes for Energy and Transport
                      Technologies (POF3-621) / 6G4 - Jülich Centre for Neutron
                      Research (JCNS) (POF3-623)},
      pid          = {G:(DE-HGF)POF3-144 / G:(DE-HGF)POF3-524 /
                      G:(DE-HGF)POF3-6212 / G:(DE-HGF)POF3-6213 /
                      G:(DE-HGF)POF3-6G4},
      experiment   = {EXP:(DE-Juel1)ILL-IN12-20150421},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000486663700001},
      doi          = {10.1103/PhysRevMaterials.3.093602},
      url          = {https://juser.fz-juelich.de/record/865225},
}