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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},
}