Temperature evolution of crystal structure and invetigation of magnetic order in Ce(Cu,Al)4 compounds
Intermetallic Ce(Cu,Al)4 compounds crystallize in the ordered non-centrosymmeric tetragonal structure of BaNiSn3-type (space group 107, I4mm). Although the ground state nature of Ce(Cu,Al)4 has not been reported so far, other interesting features were found in these compounds. The highly interesting phenomenon was observed in CeCuAl3: the existence of new quasi-bound states, vibrons, arising from strong magneto-elastic coupling (CF exciton-phonon interaction) and observed as an additional peak in the inelastic neutron scattering energy spectra. Ce(Cu,Al)4 belong to materials studied within our broader project focused on existence of vibron states and its influence on magnetic and structural properties and vice versa. All compounds from Ce(Cu,Al)4 series order magnetically below 2.5 - 3 K. No other phase transition was observed down to 0.4 K. The aim of proposed experiment is to determine the magnetic structure and to map the temperature development of crystal structure in these compounds in order to observe possible distortion and/or lowering of local symmetry. Such changes of crystal structure could strongly influence the CF exciton-phonon phenomena in Ce(Cu,Al)4.
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KLICPERA Milan; BOEHM Martin; JAVORSKY Pavel and OULADDIAF Bachir. (2015). Temperature evolution of crystal structure and invetigation of magnetic order in Ce(Cu,Al)4 compounds. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-31-2447
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