Implantation of 111In in the Heusler alloys Pd2MnZ (Z=Sn,Sb,Ge,In) following heavy ion nuclear reactions:: Measurement of magnetic hyperfine field using PAC spectroscopy

Ion implantation of the recoil In-111 nuclei following heavy ion nuclear reactions Pd-108(Li-7,4n) In-111 and Pd-108(Li-6,3n)In-111 has been used to implant In-111 probes in the Hensler alloys Pd(2)MnZ(Z=Sn,Sb,Ge,In). Perturbed Angular Correlation method was used to study the hyperfine magnetic field in these alloys. Direct implantation of In-111 probe nuclei was used to great advantage in the present case resulting in large implantation efficiency. Only a few hours of irradiation time with moderate beam current of the order of 400-500 nA resulted in sufficient implanted In-111 activity on the sample for good quality measurements. The hyperfine field was measured at In-111 probe nuclei substituting Mn and Z sites as a function of temperature. The fraction of In-111 nuclei occupying Mn atom sites was found to increases with the annealing of sample at higher temperatures.