Hyperfine interactions for tin impurity atoms in RGa intermetallics

Changes were found in the magnetic structures of NdGa, HoGa, and ErGa at 18-22, 10-22, and 8-16 K respectively. Such changes were sought and examined in RGa intermetallics (R = Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er) by investigating the hyperfine interactions for 119 Sn impurity atoms replacing gallium atoms. The Mossbauer absorption spectra measured between 5 K and the Curie temperatures include one magnetic sextet. The magnetic structure changes were established from the observed temperature dependences of the quadrupole shifts of hyperfine structure components