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Ru-doped La0.7(Ba–Ca)0.3MnO3 thin films: indirect evidence of phase separation

Magnetic and transport properties of thin films of La0.7BaxCa0.3−xMn1−yRuyO3 (where x = 0.1, 0.2, 0.3 and y = 0, 0.1) fabricated using the pulsed laser deposition technique have been investigated. While La–Ba–Ca–Mn–O samples with no doping on B-sites show very strong ferromagnetism with a rather high TC, Ru-doped samples have a much lower TC. This reduction of ferromagnetism is consistent with the results obtained from transport measurements: under zero field, La0.7Ba0.1Ca0.2Mn0.9Ru0.1O3 thin films shows an insulator-to-metal transition at 75 K, the transition temperature shifts to lower temperatures under applied magnetic fields, and a positive magnetoresistance (MR) was observed. It is likely that Ru doping creates some antiferromagnetic insulating matrix which separates a basically ferromagnetic background into isolated ferromagnetic domains so that, even though the phase is ferromagnetic, it is not conductive. A ferromagnetic-insulating state appears in the composition of x = 0.3 hole-doped concentration, which is very unexpected, and the positive MR is also very anomalous.