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

Cabrera-Pasca, G.A., Rao, M.N., Oliveira, J.R.B., Rizzuto, M.A., Added, N., Seale, W.A, Ribas, R.V., Medina, N.H, Saxena, R.N., Carbonari, A.W.

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

AUTOR(ES)

Cabrera-Pasca, G.A., Rao, M.N., Oliveira, J.R.B., Rizzuto, M.A., Added, N., Seale, W.A, Ribas, R.V., Medina, N.H, Saxena, R.N., Carbonari, A.W.

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2005-09

RESUMO

Ion implantation of the recoil 111In nuclei following heavy ion nuclear reactions 108Pd(7Li,4n)111In and 108Pd(6Li,3n)111In has been used to implant 111In probes in the Heusler alloys Pd2MnZ(Z=Sn,Sb,Ge,In). Perturbed Angular Correlation method was used to study the hyperfine magnetic field in these alloys. Direct implantation of 111In 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 111In activity on the sample for good quality measurements. The hyperfine field was measured at 111In probe nuclei substituting Mn and Z sites as a function of temperature. The fraction of 111In nuclei occupying Mn atom sites was found to increases with the annealing of sample at higher temperatures.