Lattice dynamics in elemental modulated Sb2Te3 films

D. Bessas; M. Winkler; I. Sergueev; J. D. König; H. Böttner; R. P. Hermann

doi:10.1002/pssa.201532431

Lattice dynamics in elemental modulated Sb₂Te₃ films

D. Bessas, M. Winkler, I. Sergueev, J. D. König, H. Böttner, R. P. Hermann

Neutron & X-Ray Scattering, & Thermophys

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

1 Scopus citations

Abstract

The crystallinity and the lattice dynamics in elemental modulated Sb2Te3 films are investigated microscopically using high energy synchrotron radiation diffraction combined with 121Sb nuclear inelastic scattering. The correlation length is found to be finite but less than 100 Å. The element specific density of phonon states is extracted. A comparison with the element specific density of phonon states in bulk Sb2Te3 confirms that the main features in the density of phonon states arise from the layered structure. The average speed of sound at 40K, 1.74(2)kms-1, is almost the same compared to bulk Sb2Te3 at 20K, 1.78(2)kms-1. Similarly, the change in the acoustic cut-off energy is within the experimental detection limit. Thus, we suggest that the lattice thermal conductivity in elemental modulated Sb2Te3 films should not be significantly changed from its bulk value.

Original language	English
Pages (from-to)	694-698
Number of pages	5
Journal	Physica Status Solidi (A) Applications and Materials Science
Volume	213
Issue number	3
DOIs	https://doi.org/10.1002/pssa.201532431
State	Published - Mar 1 2016

Funding

The DFG priority program SPP1386 "Nanostructured Thermoelectrics" and the Helmholtz University Young Investigator Group "Lattice Dynamics in Emerging Functional Materials" are acknowledged for the financial support of this study. RPH acknowledges support from the Materials Sciences and Engineering Division, Office of Basic Energy Sciences, US Department of Energy. RPH and DB acknowledge the European Synchrotron Radiation Facility and the Advanced Photon Source for provision of synchrotron radiation beam time and the helpful discussions with Dr. A. Chumakov and Dr. R. Rüffer at ID-18 and the help of Dr. D. Robinson during data acquisition at 6-ID-D, respectively.

Funders	Funder number
Helmholtz University
U.S. Department of Energy
Basic Energy Sciences
Division of Materials Sciences and Engineering
Deutsche Forschungsgemeinschaft	SPP1386
European Synchrotron Radiation Facility

Keywords

Lattice dynamics
Sb2Te3
elemental modulated films
nuclear inelastic scattering
synchrotron radiation diffraction

Access to Document

10.1002/pssa.201532431

Cite this

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title = "Lattice dynamics in elemental modulated Sb2Te3 films",

abstract = "The crystallinity and the lattice dynamics in elemental modulated Sb2Te3 films are investigated microscopically using high energy synchrotron radiation diffraction combined with 121Sb nuclear inelastic scattering. The correlation length is found to be finite but less than 100 {\AA}. The element specific density of phonon states is extracted. A comparison with the element specific density of phonon states in bulk Sb2Te3 confirms that the main features in the density of phonon states arise from the layered structure. The average speed of sound at 40K, 1.74(2)kms-1, is almost the same compared to bulk Sb2Te3 at 20K, 1.78(2)kms-1. Similarly, the change in the acoustic cut-off energy is within the experimental detection limit. Thus, we suggest that the lattice thermal conductivity in elemental modulated Sb2Te3 films should not be significantly changed from its bulk value.",

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author = "D. Bessas and M. Winkler and I. Sergueev and K{\"o}nig, {J. D.} and H. B{\"o}ttner and Hermann, {R. P.}",

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AU - Bessas, D.

AU - Winkler, M.

AU - Sergueev, I.

AU - König, J. D.

AU - Böttner, H.

AU - Hermann, R. P.

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N2 - The crystallinity and the lattice dynamics in elemental modulated Sb2Te3 films are investigated microscopically using high energy synchrotron radiation diffraction combined with 121Sb nuclear inelastic scattering. The correlation length is found to be finite but less than 100 Å. The element specific density of phonon states is extracted. A comparison with the element specific density of phonon states in bulk Sb2Te3 confirms that the main features in the density of phonon states arise from the layered structure. The average speed of sound at 40K, 1.74(2)kms-1, is almost the same compared to bulk Sb2Te3 at 20K, 1.78(2)kms-1. Similarly, the change in the acoustic cut-off energy is within the experimental detection limit. Thus, we suggest that the lattice thermal conductivity in elemental modulated Sb2Te3 films should not be significantly changed from its bulk value.

AB - The crystallinity and the lattice dynamics in elemental modulated Sb2Te3 films are investigated microscopically using high energy synchrotron radiation diffraction combined with 121Sb nuclear inelastic scattering. The correlation length is found to be finite but less than 100 Å. The element specific density of phonon states is extracted. A comparison with the element specific density of phonon states in bulk Sb2Te3 confirms that the main features in the density of phonon states arise from the layered structure. The average speed of sound at 40K, 1.74(2)kms-1, is almost the same compared to bulk Sb2Te3 at 20K, 1.78(2)kms-1. Similarly, the change in the acoustic cut-off energy is within the experimental detection limit. Thus, we suggest that the lattice thermal conductivity in elemental modulated Sb2Te3 films should not be significantly changed from its bulk value.

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