Investigation of the magnetic hyperfine field at Gd and In sites in GdTIn (T=Ni, Pd, Cu) compounds

Perturbed gamma–gamma angular correlation technique was used to measure the hyperfine interactions in the magnetic compounds GdNiIn, GdPdIn and GdCuIn using the 111In→111Cd and 140La→140Ce probe nuclei at the In and Gd sites, respectively. In each compound and for the measurements above the magnetic ordering temperature a unique quadrupole frequency with high asymmetry parameter η was observed for 111Cd probe at In sites. Below the ordering temperature, the spectra for 111Cd show a combined magnetic dipole plus electric quadrupole interaction whereas a unique magnetic interaction was observed for 140Ce spectra. A linear relationship between the saturated magnetic hyperfine field (MHF) and the magnetic transition temperature was observed for both probes, indicating that the main contribution to the MHF comes from the conduction electron polarization.