Crystal field of Dy implanted in Au single crystals, obtained by Mossbauer spectroscopy

The field dependence of the hyperfine interaction of 161Dy in Au 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 Au by means of low-temperature ion implantation. From the measurements the authors determine the parameters of the cubic crystalline electric field acting on the Dy nuclei: A4(r4)=-25.4-2.5+1.2K and A6(r6)=+1.34-1.22+0.50K, in agreement with EPR results. The ground state is a Gamma 8(1) quartet separated from a Gamma 8(2) excited quartet by Delta =10.8-0.6+0.9K