Abstract

The Mossbauer effect has been used to measure the magnetic hyperfine field at the site of197Au impurities in the heavy Rare Earth metals Gd, Tb, Dy, Ho and Er at 4.2 K. The magnetic hyperfine field decreases in a non linear way with decreasing spin of the Rare Earth host. For197Au this decrease is stronger than for any other impurity investigated up to now. Possible reasons for this behaviour are discussed.

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