A simple model is proposed for studying the lnttice dynamics of h.c.p. rare carth metala. The interaction between core-core and (f, d)shells-(f, d)shells via conduction electrons is considered through a screened-Coulomb potential. The direct Coulomb interaction between cores and (f, d)shcll electrons is essentially Rhort-range and is, therefore, deacribcd through a non-central type interaction extending upto the third neighbours.
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