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@ARTICLE{Mchel:17822,
      author       = {Möchel, A. and Sergueev, I. and Wille, H.-C. and Voigt, J.
                      and Prager, M. and Stone, M. B. and Sales, B. C. and
                      Guguchia, Z. and Shengelaya, A. and Keppens, V. and Hermann,
                      R.},
      title        = {{L}attice dynamics and anomalous softening in the
                      {Y}b{F}e4{S}b12 skutterudite},
      journal      = {Physical review / B},
      volume       = {84},
      number       = {18},
      issn         = {1098-0121},
      address      = {College Park, Md.},
      publisher    = {APS},
      reportid     = {PreJuSER-17822},
      pages        = {184306},
      year         = {2011},
      note         = {We thank Dr. D. Robinson and Mr. D. Bessas for their
                      support during the synchrotron radiation measurements and
                      Professor H. Schober and Dr. M. M. Koza for helpful
                      discussions. We thank Professor F. Grandjean and Dr. L.
                      Rebbouh for their help during the Mossbauer spectral
                      measurements. The European Synchrotron Radiation Facility,
                      the Advanced Photon Source, and the Spallation Neutron
                      Source are acknowledged for provision of synchrotron and
                      neutron beam time at the nuclear resonance station ID18 and
                      ID22N, the high-energy station 6-ID-D and the wide
                      Angular-Range Chopper Spectrometer, respectively. R.H.
                      acknowledges support from the Helmholtz University Young
                      Investigator Group "Lattices Dynamics in Emerging Functional
                      Materials." Work at The University of Tennessee was
                      supported by NSF Grant DMR-0804719. BCS acknowledges support
                      from the 'Materials Sciences and Engineering Division',
                      Office of Science, US Department of Energy. A portion of
                      this research at Oak Ridge National Laboratory's Spallation
                      Neutron Source was sponsored by the Scientific User
                      Facilities Division, Office of Basic Energy Sciences, US
                      Department of Energy.},
      abstract     = {The lattice dynamics of the filled skutterudite YbFe4Sb12
                      was studied by resonant ultrasound spectroscopy and an
                      anomalous softening in the temperature dependence of the
                      elastic constants at similar to 50 K was observed. This
                      anomaly can not be explained by the dynamics of the filler,
                      in contrast to other filled skutterudites. We have further
                      investigated the origin of this anomaly using macroscopic
                      and microscopic measurements. A rearrangement of the
                      spectral weight of the Yb phonon states was observed in the
                      temperature dependence of the density of phonon states,
                      obtained by inelastic neutron scattering. We suggest that
                      the anomaly is due to a change of the Yb valence state and
                      that the anomaly and the phonon spectral weight
                      rearrangement have the same origin.},
      keywords     = {J (WoSType)},
      cin          = {PGI-4 / JCNS-2 / JARA-FIT / JCNS (München) ; Jülich
                      Centre for Neutron Science JCNS (München) ; JCNS-FRM-II},
      ddc          = {530},
      cid          = {I:(DE-Juel1)PGI-4-20110106 / I:(DE-Juel1)JCNS-2-20110106 /
                      $I:(DE-82)080009_20140620$ /
                      I:(DE-Juel1)JCNS-FRM-II-20110218},
      pnm          = {Grundlagen für zukünftige Informationstechnologien /
                      Großgeräte für die Forschung mit Photonen, Neutronen und
                      Ionen (PNI)},
      pid          = {G:(DE-Juel1)FUEK412 / G:(DE-Juel1)FUEK415},
      experiment   = {EXP:(DE-MLZ)External-20140101},
      shelfmark    = {Physics, Condensed Matter},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000297474000004},
      doi          = {10.1103/PhysRevB.84.184306},
      url          = {https://juser.fz-juelich.de/record/17822},
}