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A great deal of experimental work using perturbed angular correlation (PAC)has succeed in measuring hyperfine fields in Ce diluted in metallic systems,thus allowing the determination of the local impurity moment at lowtemperatures. Motivated by such experimental work on Ce(140) placed on a R siteof the rare earth (R = Gd, Tb, Dy, Ho, Er) in RCo_2, we theoretically discuss,within a simple model, the local magnetic moments and thereby calculate themagnetic hyperfine fields. The results are in good agreement with theexperimental data. For the sake of comparison we recall our previous results onTa d-impurity embedded in the same hosts.

Magnetic moment formation at a dilute Ce(140) impurity in RCo_2 compounds