Vibron states investigation in Ce(Cu,Al)4 compounds
CeCuxAl4-x compounds crystallize in the ordered non-centrosymmeric tetragonal BaNiSn3-type structure (space group 107, I4mm). The strong interaction between crystal field (CF) excitons and phonon modes was observed in parent CeCuAl3. This type of interaction leads to the formation of so called vibron quasi-bound state, which has been observed as an additional peak in the inelastic neutron scattering spectra of only a few other Ce-based intermetallic compounds, e.g. CeAl2 or CePd2Al2. Our recent investigation of CeCuxAl4-x led to the observation of two clear crystal-field-like peaks in all investigated compounds (x = 0.75, 0.9 and 1.1). In the same time, low-energy part of the spectra exhibits another possible CF-like peak below 1 meV. High resolution experiment is necessary to reveal the low-energy phenomena in detail and to verify or deny the presence of third CF peak below 1 meV. The results will be part of our broader investigation of CeCuxAl4-x compounds.
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KLICPERA Milan; D.T. Adroja; BOEHM Martin; JAVORSKY Pavel; MUTKA Hannu and DOI. (2016). Vibron states investigation in Ce(Cu,Al)4 compounds. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-04-476
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