Abstract
Polycrystalline manganites Pr 0.8Na 0.2MnO 3 doped by ruthenium (0.0≤ x Ru≤0.2) were prepared by the sol–gel process. The magnetic field induced metamagnetism was observed to occur with a large resistivity drop at 3 K for x Ru≤0.02 samples, which can be sorted into the kind of CMR phenomenon. It was found that the 0.01 Ru doping increased T C and decreased the metamagnetic critical field than that of the undoped sample. The doped manganites show a quick increase in their magnetic moments as x Ru increases from 0.01 to 0.04, but the larger fraction of Ru doping (0.04≤ x Ru≤0.2) reduces their M and T C. All the five doped samples have larger magnetic moments than that of the host sample. Ru doping of x Ru>0.01 results in a rapid disappearance for the observation of long range spin and charge ordering in the samples’ M– T curves, which is characteristic of the undoped sample. It was found that larger low-temperature MR favored decrease in the metamagnetic critical field. Finally, the phase diagram of Ru doping vs. transition temperatures is presented to summarize the experiments.
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