Abstract
The field dependence of the hyperfine interaction of161Dy impurities in Cu has been studied in external magnetic fields up to 3.21 T by means of Mossbauer spectroscopy. 161Dy was introduced into a single crystal of Cu by means of low temperature ion implantation. From the measurements we determine the parameters of the cubic crystalline electric field acting on the Dy nuclei:A 4 =−28±58 K and $$A_6 \langle r^6 \rangle = 20.6_{ - 0.2}^{ + 3.1} K$$ . The ground state is a $$\Gamma _7 $$ doublet, separated well from a $$\Gamma _8 $$ excited quartet by $$\Delta = 44.8_{ - 13.3 }^{ + 1.8} K$$ .
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