Contrasting Magnetic Characteristics of Disordered Nd0.5Ba0.5Mn0.5Fe0.5O3−δ/2 and 112-Type Ordered NdBaMnFeO6−δ Perovskites

The magnetic properties of disordered Nd_0.5Ba_0.5Mn_0.5Fe_0.5O_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_0.5Ba_0.5Mn_0.5Fe_0.5O_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_0.5Ba_0.5Mn_0.5Fe_0.5O_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.