Exploring Magnetic Behaviour in La0.70Pr0.30Mn0.8Co0.2O3 Perovskite.

This work aims to understand the magnetic behaviour in the La0.70Pr0.30Mn0.8Co0.2O3 perovskite sample. The sample was prepared by a solid-state reaction. The Rietveld refinement gives orthorhombic crystal structure with lattice constants, i.e. a = 5.4928(5) Å, b = 7.7683(7) Å, and c = 5.5148(5) Å. The magnetization shows the ferromagnetic to paramagnetic transition. The blocking temperature (TB = 151 K) and paramagnetic Curie temperature (θp = 189 K) have been found by the magnetization versus temperature (M-T) curves. The blocking temperature indicates the interaction between internal magnetic energy and thermal energy. This interaction can also be clearly seen in the coinciding temperature (Tcon). The scaling law also supports the paramagnetic Curie temperature. The derivative of M-T curves shows a magnetic phase transition at 163 K temperature. The M-H loops show the ferromagnetic nature at a lower temperature and paramagnetic at room temperature which supports our M-T results. The Tg (spin-glass transition) decreases with increasing field. The Kneller's fitting gives the TB = 176 K. The loop squareness value is decreasing with increasing temperatures. The peak width (2Hm) suggests that magnetic domains exist in the sample at lower temperature. [ABSTRACT FROM AUTHOR]