Abstract
The magnetic property of double doped manganite Nd 0.5(1+ x) Ca 0.5(1− x) Mn (1− x) Cr x O 3 with a fixed ratio of Mn 3+:Mn 4+=1:1 has been investigated. For the undoped sample, it undergoes one transition from charge disordering to charge ordering (CO) associated with paramagnetic (PM)-antiferromagnetic (AFM) phase transition at T<250 K. The long range AFM ordering seems to form at 35 K, rather than previously reported 150 K. At low temperature, an asymmetrical M– H hysteresis loop occurs due to weak AFM coupling. For the doped samples, the substitution of Cr 3+ for Mn 3+ ions causes the increase of magnetization and the rise of T c. As the Cr 3+ concentration increases, the CO domain gradually becomes smaller and the CO melting process emerges. At low temperature, the FM superexchange interaction between Mn 3+ and Cr 3+ ions causes a magnetic upturn, namely, the second FM phase transition.
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