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Low-energy phonon dispersion in LaFe4Sb12

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons138501

Sischka,  Erik
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126838

Schnelle,  Walter
Walter Schnelle, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons126726

Leithe-Jasper,  Andreas
Andreas Leithe-Jasper, Chemical Metal Science, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Zitation

Koza, M. M., Boehm, M., Sischka, E., Schnelle, W., Mutka, H., & Leithe-Jasper, A. (2015). Low-energy phonon dispersion in LaFe4Sb12. Physical Review B, 91(1): 014305, pp. 1-8. doi:10.1103/PhysRevB.91.014305.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-0024-BF99-D
Zusammenfassung
We studied the vibrational dynamics of a single crystal of LaFe 4Sb 12 by three-axis inelastic neutron spectroscopy. The dispersion of phonons with wave vectors q along [xx0] and [xxx] directions in the energy range of eigenmodes with high amplitudes of lanthanum vibrations, i.e., at planckomegalsim12 meV is identified. Symmetry-avoided anticrossing dispersion of phonons is established in both monitored directions and distinct eigenstates at high-symmetry points and at the Brillouin-zone center are discriminated. The experimentally derived phonon dispersion and intensities are compared with and backed up by ab initio lattice dynamics calculations. Results of the computer model match well with the experimental data.