Magnetic properties and conduction mechanism in La0.7Sr0.25Na0.05Mn0.8Al0.2O3 manganites
1 : Laboratory of Condensed Matter and Nanosciences, Faculty of Sciences of Monastir, , Tunisia
2 : institut Néel, CNRS et Université Joseph Fourier, BP 166 ,38042 Grenoble, France
Université Joseph Fourier - Grenoble I