Effect of oxygen content on magnetization and magnetoresistance properties of CMR manganites

Анотація

The influence of oxygen content on the magnetization and electrical resistivity of Ln_0.5A_0.5MnO₃ (Ln=La,Pr,Nd; A=Ca,Ba) manganites with the perovskite structure is investigated. It is shown that the La_0.5Ca_0.5MnO_3-g compound undergoes a sequence of transitions from an antiferromagnetic (g=0) to a spin-glass (g=0.17) state and then to an inhomogeneous ferromagnetic (g=0.3) state. A transition from an antiferromagnetic charge-ordered state to a ferromagnetic charge-disordered state in Nd_0.5Ca_0.5 MnO_3-g is observed as the oxygen content is reduced to where g=0.07. The Nd_0.5Ba_0.5 MnO_3-g compound shows an increase of the Curie point from 110 K (g=0) up to 310 K (g=0.3). In addition, a large magnetoresistance is revealed which develops below their Curie temperature despite the absence of Mn³⁺√Mn⁴⁺ pairs. A Zener double-exchange interaction is usually used in literature to explain the magnetic and electrical properties of hole-doped perovskite manganites. The data obtained support the mechanism of superexchange interactions between magnetic moments of the manganese ions via oxygen.