Abstract
The hyperfine field distribution at substitutional Co clustersin fcc Cu and Ag hosts as a function of the chemicalcomposition of the Co nearest neighbourhoods is studied. Theseclusters contain up to 135 Co and the theoretical ab initio calculations are performed with thereal-space-LMTO-ASA method. We find that Co hyperfine fieldsexhibit an almost linear dependence on the number of hostatoms in the first co-ordination shell. This result supportswhat has been recently suggested by an empirical model based onresults inferred from NMR experiments. Nevertheless, we alsoobserve a site dependence that is not completely described bythis simple empirical model and discuss the role playedby further neighbourhoods.
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