Effect of praseodymium doping on the structural and magnetic properties of La_(1.2-x)Pr_xSr_(1.8)Mn_2O_7 bilayer manganese oxides

摘要

Structural and magnetic properties of La_(1.2-x)Pr_xSr_(1.8)Mn_2O_7 (0≤ x ≤1.2) bilayers manganese oxides have been investigated. Structural characterizations showed that all our synthesized samples crystallize in the tetragonal structure with I4/mmm space group. Magnetization measurements versus temperature showed that all of our samples exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. The Curie temperature T_c decreases with increasing praseodymium content. It is found to decrease from 315 K for x = 0 to 265 K for x = 1.2.