Vacancy effects on the physical properties in lacunar Pr0.7−x□xBa0.3MnO3 oxides

Abstract Effects of deficient praseodymium upon physical properties of Pr 0.7 Ba 0.3 MnO 3 have been investigated. Pr 0.7− x □ x Ba 0.3 MnO 3 (0⩽ x ⩽0.23) powder samples have been elaborated by the conventional ceramic method at 1400°C. Our samples crystallize in the rhombohedral perovskite system with R 3 c space group and exhibit a paramagnetic to ferromagnetic transition with decreasing temperature. The Curie temperature T C increases slightly with increasing vacancy content. They exhibit also a semiconducting-metallic transition when the temperature decreases. T ρ shifts to higher values with increasing deficiency content.