文章基本信息

标题：Lattice dynamics in CePd ₂Al ₂ and LaPd ₂Al ₂
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作者：Petr Doležal ; Petr Cejpek ; Satoshi Tsutsui 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2021
卷号：11
DOI：10.1038/s41598-021-99904-7
语种：English
出版社：Springer Nature
摘要：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 2Al 2. Here the study of phonon dispersion curves of (Ce,La)Pd 2Al 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.