1. Physics Department, Federal University of São Carlos, CEP 13565-905, São Carlos, SP, Brazil
2. Institute of Physics “Gleb Wataghin” (IFGW), State University of Campinas, CEP 13083-859, Campinas, SP, Brazil
3. Physics Department, IGCE, Paulista State University, CEP 13506-900, Rio Claro, SP, Brazil
4. Universidad Nacional de San Agustín de Arequipa, Av. Independéncia s/n, Arequipa, Peru