Ferromagnetism in deficient-neodymium Nd0.7−x□xSr0.3MnO3 manganite oxides

Abstract Structural and magnetic properties of neodymium-deficient Nd 0.7− x □ x Sr 0.3 MnO 3 manganite oxides have been investigated. Nd 0.7− x □ x Sr 0.3 MnO 3 powder samples have been elaborated by the conventional solid state reaction at high temperature. Structural studies show that all our samples crystallize in the orthorhombic structure. The unit cell volume decreases with increasing the deficiency content. Magnetization measurements versus temperature at H=500 Oe show that all neodymium deficient samples exhibit a paramagnetic–ferromagnetic transition with decreasing temperature. The Curie temperature increases with increasing deficiency content. It is found to increase from 205 K ( x = 0.0 ) to 250 K ( x = 0.2 ) .