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 Ba Mn Fe O and ordered NdBaMnFeO 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 Ba Mn Fe O sample, whereas the ordered NdBaMnFeO 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 Ba Mn Fe O perovskite and the magnetic-disordering state in the structurally ordered NdBaMnFeO perovskite could be attributed to the alteration of the oxidation state of Mn.