The lattice dynamics of NdCu2
has been investigated with inelastic neutron scattering measurements. An uniaxial Born–von
Karman model has been used to calculate the phonon dispersion relation. A verification of
a phonon–crystal electric field (CEF) interaction was found from temperature dependent
measurements of phonons and CEF excitations. The impact of the phonon–CEF
interaction was found to be strongest at the Brillouin zone centre among the 7.5 meV
Ag-phonon
mode and the ε4
CEF level. This has been verified with theoretical model calculations.
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