Lattice dynamics in elemental modulated Sb2Te3 films

• Published in: Physica status solidi. A, Applications and materials science Applications and materials science, 2016-03, Vol.213 (3), p.694-698
• Main Authors: Bessas, D., Winkler, M., Sergueev, I., König, J. D., Böttner, H., Hermann, R. P.
• Format: Article
• Language: English
• Subjects: Chemistry; Chimie; Correlation lengths; Crystal lattices; Density (specific gravity); Density of phonon state; Detection limits; Diffraction; Dynamics; elemental modulated films; High energy synchrotron; Inelastic scattering; Lattice dynamics; Lattice thermal conductivity; Lattice vibrations; Layered Structures; nuclear inelastic scattering; Phonons; Physical, chemical, mathematical & earth Sciences; Physique, chimie, mathématiques & sciences de la terre; Sb2Te3; Synchrotron radiation; synchrotron radiation diffraction; Synchrotron radiation diffractions; Synchrotrons
• ISSN: 1862-6300; 1862-6319; 1862-6319
• DOI: 10.1002/pssa.201532431

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.