Journal Article

PreJuSER-17637

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Lattice dynamics in the thermoelectric Zintl compound Yb14MnSb11

Möchel, A.FZJ* ; Sergueev, I. ; Wille, H.-C. ; Juranyi, F. ; Schober, H. ; Schweika, W.FZJ* ; Brown, S. R. ; Kauzlarich, S. M. ; Hermann, R.FZJ*

2011
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/10905  doi:10.1103/PhysRevB.84.184303

Abstract: The density of phonon states in the thermoelectric material Yb14MnSb11 has been studied first by inelastic neutron scattering and second in an element-specific way by nuclear inelastic x-ray scattering. The low sound velocity of 1880(50) m/s as obtained from the density of phonon states can be identified as an important reason for the low heat transport in this system. The high melting temperature of Yb14MnSb11 contrasts with the low energy of all phonons (<25 meV) and relates to an unusual lack of softening of phonon modes with temperature, when comparing the phonon density of states observed at ambient temperatures and at 1200 K. We have also measured the density of phonon states of the related Eu14MnSb11 compound and of the thermoelectric Zintl phase Zn4Sb3 in order to compare with related thermodynamic properties of Yb14MnSb11 and to elucidate the different mechanisms of the heat conductivity reduction in Zintl phases.

Keyword(s): J

Note: We thank D. Bessas for his support during the NIS measurements, Dr. M. M. Koza for helpful discussions, and Professor Gary J. Long and Professor F. Grandjean for their assistance with preliminary work on these Zintl phases. The European Synchrotron Radiation Facility (ESRF), Grenoble, France; the Advanced Photon Source (APS), Argonne National Laboratory, Argonne, USA; the Swiss spallation neutron source SINQ, Paul Scherrer Institute, Villigen, Switzerland; and the Institut Laue-Langevin (ILL), Grenoble, France, are acknowledged for synchrotron and neutron beam time at the nuclear resonance station ID18 and ID22N, the 6-ID-D high-energy station, the cold-neutron time-of-flight spectrometer FOCUS, and the IN6 spectrometer, respectively. R. H. acknowledges support from the Helmholtz-University Young Investigator Group "Lattices Dynamics in Emerging Functional Materials."

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Contributing Institute(s):

1. Streumethoden (PGI-4)
2. Streumethoden (JCNS-2)
3. Jülich-Aachen Research Alliance - Fundamentals of Future Information Technology (JARA-FIT)

Research Program(s):

1. Grundlagen für zukünftige Informationstechnologien (P42)
2. Großgeräte für die Forschung mit Photonen, Neutronen und Ionen (PNI) (P55)

Appears in the scientific report 2011

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