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We have studied the effect of Al doping on the structural, magnetic andelectrical properties of La$_{1-x}$Ba$_x$Mn$_{1-x}$Al$_x$O$_3$ ($0\leq x \leq0.25$) manganite, annealed in two 750$^oC$ and 1350$^oC$ temperatures. The XRDanalysis shows that the structures in all samples have single phaserhombohedral structure with R$\bar{3}$c space group. The unit cell volumealmost decrease with increasing the Al doping in all samples. The grain growthwith increasing annealing temperature and Al doping also have been studied. Weobserved that, T$_c$ temperature decreases when the Al ion substitute in Mn ionsite. The magnetic study of the samples via magnetic susceptibility results inGriffiths and spin-glass phase for samples doped with aluminium. Along theresistivity measurement results, the $T_{MIT}$ (metal-insulator) transitiontemperatures decrease and the system become an insulator. The insulator-metaltransition occurs for L0 sample in near 165K, while this transition is weak forH0 sample due to oxygen non-stoichiometry.Using three models viz. 1. Adiabaticsmall polaron hoping, 2.Variable range hopping, and 3. Percolation model, theresistance have been studied.

journal of magnetism and magnetic materials

Influence of Al-doping on the structural, magnetic, and electrical  properties of La$_{1-x}$Ba$_x$Mn$_{1-x}$Al$_x$O$_3$ ($0\leq x \leq 0.25$)  manganites