Vibron states in CePd2Al1.9Ga0.1 and CePd2Al1.6Ga0.4 compounds
Tetragonal (Ce,La)Pd2Al2-xGax compounds crystallize in the ordered non-centrosymmeric CaBe2Ge2-type structure (space group 129, P4/nmm) and undergo the structural phase transition to the lower symmetrical structure at low temperatures. The strong interaction between crystal field and phonon modes was observed in parent CePd2Al2. 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 CeCuAl3. Our recent investigation of CePd2Al2-xGax and LaPd2Al2-xGax compounds lead to very interesting results revealing the microscopic behavior and its development with Al-Ga content. The concentration development and nature of the structural phase transitions in CePd2Al2-xGax and LaPd2Al2-xGax compounds indicates that the vibron states are present for x < 0.8. In the proposed experiment, we want to investigate two compounds with x = 0.1 and 0.4 to observe the development of vibron state excitation peak in detail.
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KLICPERA Milan; DOLEZAL Petr; JAVORSKY Pavel; MUTKA Hannu and ROLS Stephane. (2016). Vibron states in CePd2Al1.9Ga0.1 and CePd2Al1.6Ga0.4 compounds. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-01-442
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