The ABO 3 type manganites ͑LaR͒ 0.45 ͑CaSr͒ 0.55 MnO 3 ͑R=Eu 3+ -a nonmagnetic ion and Tb 3+ -a magnetic ion͒ which possess large A-site size-disorder, exhibit metamagnetic transitions as a function of magnetic field. Below a certain crossover temperature and depending on the magnetic field sweep rate, the metamagnetic transition transforms from a broad to sharp step-like transitions. This crossover temperature increases on increasing the field sweep rate. The effect of field sweep rate on the critical field …
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