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We investigate the magnetic and crystal electric field (CEF) states of theKondo lattice system CeCuGa3 by muon spin relaxation (muSR), neutrondiffraction, and inelastic neutron scattering (INS) measurements. Anoncentrosymmetric BaNiSn3-type tetragonal crystal structure (space group I4mm)is inferred from x-ray as well as from neutron powder diffraction. Thelow-temperature magnetic susceptibility and heat capacity data show an anomalynear 2.3 - 2.5~K associated with long range magnetic ordering, which is furtherconfirmed by muSR and neutron diffraction data. The neutron powder diffractioncollected at 1.7 K shows the presence of magnetic Bragg peaks indexed by anincommensurate magnetic propagation vector k = (0.148, 0.148, 0) and themagnetic structure is best described by a longitudinal spin density wave withordered moments lying in ab-plane. An analysis of the INS data based on a CEFmodel reveals the presence of two magnetic excitations near 4.5 meV and 6.9meV. The magnetic heat capacity data suggest an overall CEF splitting of 20.7meV, however the excitation between 20 and 30 meV is very broad and weak in ourINS data, but could provide an evidence of CEF level in this energy range inagreement with the magnetic entropy. Our analysis of INS data based on theCEF-phonon model indicates that the two excitations at 4.5 meV and 6.9 meV havetheir origin in CEF-phonon coupling (i.e. splitting of one CEF peak into twopeaks, called vibron), with an overall splitting of 28.16 meV, similar to thecase of CeCuAl3 and CeAuAl3.

Crystal Electic Field and Possible Coupling with Phonon in Kondo lattice CeCuGa3