Neutron scattering study of the quasi-elastic spectral width in CeMg, CeMg 3 and NdMg3 intermetallic compounds

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Abstract
We report neutron scattering measurements of quasi-elastic magnetic spectra in cubic compounds CeMg, CeMg3 and NdMg3 as well as in compounds diluted with Y and La. The quasi-elastic linewidth measured up to 800 K in CeMg3 shows a linear Korringa law dependence at high temperature with a negligible intercept but deviates below 100 K and tends to a residual value γ0 as T → 0 K. The magnitude of γ0 (≃ 0.5 meV) is similar to that in CeMg (≃ 0.6 meV) and NdMg3 (≃ 0.8 meV). In CeMg 3 and NdMg3 the residual linewidth decreases with dilution by La or Y, whereas in CeMg the linewidth is only slightly affected on dilution with La and increases significantly on addition of Y. This difference in behaviour suggests different origins of the low temperature relaxation mechanisms in the two systems CeMg and CeMg3

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