Contrasting Magnetic Characteristics of Disordered Nd 0.5 Ba 0.5 Mn 0.5 Fe 0.5 O 3-δ/2 and 112-Type Ordered NdBaMnFeO 6-δ Perovskites.

The magnetic properties of disordered Nd 0.5 Ba 0.5 Mn 0.5 Fe 0.5 O 3-δ/2 and ordered NdBaMnFeO 6-δ perovskites were investigated through temperature- and field-dependent DC-magnetization measurements. The temperature dependence of magnetic susceptibilities revealed that antiferromagnetic ordering occurs at temperatures below 185 K for the disordered Nd 0.5 Ba 0.5 Mn 0.5 Fe 0.5 O 3-δ/2 sample, whereas the ordered NdBaMnFeO 6-δ perovskite exhibited a paramagnetic state throughout the entire temperature range examined. Notably, the disordered sample exhibited a glassy state, even at room temperature, which transformed into an antiferromagnetic state under higher applied magnetic fields. The magnetic ordering in the disordered Nd 0.5 Ba 0.5 Mn 0.5 Fe 0.5 O 3-δ/2 perovskite and the magnetic-disordering state in the structurally ordered NdBaMnFeO 6-δ perovskite could be attributed to the alteration of the oxidation state of Mn.