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

The field dependence of the hyperfine interaction of 161Dy in Al 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 Al 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)=-32+or-32K and A6(r6)=14.1+or-1.4K. These parameters correspond to a Gamma 7 ground doublet separated from a Gamma 8 excited quartet by Delta =26+or-6K and an overall multiplet splitting of 143+or-25K