Lattice dynamics and anomalous softening in the YbFe4Sb 12 skutterudite

A. Möchel; I. Sergueev; H. C. Wille; J. Voigt; M. Prager; M. B. Stone; B. C. Sales; Z. Guguchia; A. Shengelaya; V. Keppens; R. P. Hermann

doi:10.1103/PhysRevB.84.184306

Lattice dynamics and anomalous softening in the YbFe₄Sb ₁₂ skutterudite

A. Möchel, I. Sergueev, H. C. Wille, J. Voigt, M. Prager, M. B. Stone, B. C. Sales, Z. Guguchia, A. Shengelaya, V. Keppens, R. P. Hermann

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The lattice dynamics of the filled skutterudite YbFe₄Sb ₁₂ was studied by resonant ultrasound spectroscopy and an anomalous softening in the temperature dependence of the elastic constants at ∼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.

Original language	English
Article number	184306
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	84
Issue number	18
DOIs	https://doi.org/10.1103/PhysRevB.84.184306
State	Published - Nov 29 2011

Access to Document

10.1103/PhysRevB.84.184306

Cite this

@article{eb42bcd85747436494c7b783bec9843a,

title = "Lattice dynamics and anomalous softening in the YbFe4Sb 12 skutterudite",

abstract = "The lattice dynamics of the filled skutterudite YbFe4Sb 12 was studied by resonant ultrasound spectroscopy and an anomalous softening in the temperature dependence of the elastic constants at ∼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.",

author = "A. M{\"o}chel and I. Sergueev and Wille, {H. C.} and J. Voigt and M. Prager and Stone, {M. B.} and Sales, {B. C.} and Z. Guguchia and A. Shengelaya and V. Keppens and Hermann, {R. P.}",

year = "2011",

month = nov,

day = "29",

doi = "10.1103/PhysRevB.84.184306",

language = "English",

volume = "84",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "1098-0121",

publisher = "American Physical Society",

number = "18",

}

TY - JOUR

T1 - Lattice dynamics and anomalous softening in the YbFe4Sb 12 skutterudite

AU - Möchel, A.

AU - Sergueev, I.

AU - Wille, H. C.

AU - Voigt, J.

AU - Prager, M.

AU - Stone, M. B.

AU - Sales, B. C.

AU - Guguchia, Z.

AU - Shengelaya, A.

AU - Keppens, V.

AU - Hermann, R. P.

PY - 2011/11/29

Y1 - 2011/11/29

N2 - The lattice dynamics of the filled skutterudite YbFe4Sb 12 was studied by resonant ultrasound spectroscopy and an anomalous softening in the temperature dependence of the elastic constants at ∼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.

AB - The lattice dynamics of the filled skutterudite YbFe4Sb 12 was studied by resonant ultrasound spectroscopy and an anomalous softening in the temperature dependence of the elastic constants at ∼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.

UR - http://www.scopus.com/inward/record.url?scp=82455209463&partnerID=8YFLogxK

U2 - 10.1103/PhysRevB.84.184306

DO - 10.1103/PhysRevB.84.184306

M3 - Article

AN - SCOPUS:82455209463

SN - 1098-0121

VL - 84

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 18

M1 - 184306

ER -

Lattice dynamics and anomalous softening in the YbFe₄Sb ₁₂ skutterudite

Abstract

Access to Document

Other files and links

Fingerprint

Cite this