Study of magnetism in GdTIn (T = Ni, Pd, Cu) compounds by perturbed gamma-gamma angular correlation spectroscopy

In the present work, a nuclear technique, The Time Differential Perturbed Gamma-gamma Angular Correlation (TDPAC) was used to measure the magnetic hyperfine field at Gd sites in the GdTIn (T = Ni, Pd, Cu) compounds using 140La-140Ce probe nuclei. The radioactive probe nuclei were produced by irradiation natural La with neutrons in the IEA-R1 research reactor of IPEN. Small amounts of radioactive La were arc-melted along with the constituent elements of the compounds. The crystal structure of the samples was investigated by x-ray diffraction. The PAC results showed that, below the respective magnetic ordering temperature, a pure magnetic interaction was observed at the 140Ce sites for all samples. The saturation values of the magnetic hyperfine field for GdNiIn, GdPdIn and GdCuIn along with those for GdNi2 and GdCo2 are compared with values of the magnetic hyperfine field measured with 111Cd probe nuclei for Gd compounds. (author)