Vibron states and low-energy excitations in a CeCuAl3 single crystal
CeCuAl3 crystallizes in the tetragonal BaNiSn3-type structure (space group I4mm, 107) and orders antiferromagnetically below 2.7 K. CeCuAl3 shows interesting magnetic behavior which is generally discussed as a result of interplay between the magnetic RKKY and Kondo interactions and the influence of the low lying excited CF state at 1.3 meV. Our recent investigation of CeCuAl3 revealed the amplitude modulated magnetic structure described by the propagation vector (0.4, 0.6, 0). The magnetic moments are arranged within the tetragonal basal plane and their maximal value is 0.3 μB. CeCuAl3 belongs to a few cerium compounds, where the strong CF excitons-phonons coupling resulting in new quasi-bound states, vibrons, was proposed. The aim of proposed experiment is to investigate the low-energy spectrum of a CeCuAl3 single crystal and to clarify the nature of different low lying magnetic excitations employing polarized neutron setup. The CF like state and/or spin-wave like feature sit on top of a broader continuum up to 3.5 meV, which was observed during our previous measurement on the ThALES instrument.
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KLICPERA Milan; BOEHM Martin; JAVORSKY Pavel; Jiri Kulda and STEFFENS Paul. (2016). Vibron states and low-energy excitations in a CeCuAl3 single crystal. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-04-480
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