1. Department of Solid State Physics, Doctoral School of Physics, University of Debrecen, P.O. Box 2, H-4010 Debrecen, Hungary
2. Physics Department, Faculty of Science Ain Shams University, Abbassia, 11566, Cairo, Egypt
3. Departamento de Ingeniería Física, División de Ciencias e Ingenierías, Universidad de Guanajuato-Campus León, Loma del Bosque 103, Loma del Campestre, 37150, León, Gto., Mexico
4. LCC, CNRS & University of Toulouse, 205 route de Narbonne, 31077 Toulouse, France