Abstract
The ABO 3 type charge-ordered antiferromagnetic Nd 0.50Ca 0.50MnO 3 (NCMO) manganite is doped at A-site by 3%of Ba 2+ for Ca 2+. The resulting system, Nd 0.50Ca 0.47Ba 0.03MnO 3 (NCBMO), is studied for the effects of Ba doping on the magnetic and electronic properties. On application of magnetic field to NCBMO, strongly correlated successive sharp metamagnetic and electronic transitions are observed from antiferromagnetic-insulating to ferromagnetic-metallic state at 2.5 K. The critical magnetic field ( H c) required for metamagnetism is found to reduce drastically from 15 T for undoped NCMO to 3 T for NCBMO. On increasing the temperature, the H c of NCBMO passes through a minimum. This behavior of H c of NCBMO contrasts to that of NCMO. The results are discussed in context of A-site cation disorder and size.
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