Lattice dynamics in CePd2Al2 and LaPd2Al2

The interaction between phonons and 4f electrons, which is forming a new quantum state (quasi-bound state) beyond Born-Oppenheimer approximation, is very prominent and lattice dynamics plays here a key role. There is only a small number of compounds in which the experimental observation suggest such...

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Bibliographic Details
Published in:Scientific reports 2021-10, Vol.11 (1), p.20878-20878, Article 20878
Main Authors: Doležal, Petr, Cejpek, Petr, Tsutsui, Satoshi, Kaneko, Koji, Legut, Dominik, Carva, Karel, Javorský, Pavel
Format: Article
Language:English
Subjects:
639/301/119
639/301/119/997
Approximation
Cerium
Cerium compounds
Crystal lattices
Energy
Humanities and Social Sciences
Intermetallic compounds
multidisciplinary
Phase transitions
Science
Science (multidisciplinary)
Single crystals
Symmetry
X-ray scattering
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Summary:The interaction between phonons and 4f electrons, which is forming a new quantum state (quasi-bound state) beyond Born-Oppenheimer approximation, is very prominent and lattice dynamics plays here a key role. There is only a small number of compounds in which the experimental observation suggest such a scenario. One of these compounds is CePd 2 Al 2 . Here the study of phonon dispersion curves of (Ce,La)Pd 2 Al 2 at 1.5, 7.5, 80 and 300 K is presented. The inelastic X-ray scattering technique was used for mapping the phonon modes at X and Z points as well as in Λ and Δ directions, where the symmetry analysis of phonon modes was performed. The measured spectra are compared with the theoretical calculation, showing very good agreement. The measurements were performed in several Brillouin zones allowing the reconstruction of phonon dispersion curves. The results are discussed with respect to the magneto-elastic interaction and are compared with other cerium compounds. The phonon mode symmetry A 1g was found to be unaffected by the interaction, which is in contrast to previous assumptions.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-99904-7