Tuning magnetotransport properties through chemical substitution in Pr- and Sm-doped NdRuO3 thin films

We have investigated the magnetotransport properties for solid-solution thin films of Nd_1-xPrₓRuO₃ and Nd_1-ySmyRuO₃ prepared through a solid phase epitaxy. It is found that the peculiar magnetotransport properties that emerge in NdRuO₃ are modified by the systematic control of the electron correlation strength through the tuning of the bandwidth as well as in the total angular momentum J of rare earth magnetic ions. The transition from metal to insulator is observed with increasing the concentration y of smaller Sm³⁺ in Nd_1-ySmyRuO₃, while Nd_1-xPrₓRuO₃ is kept metallic with increasing x for larger Pr³⁺. An anomalous Hall effect is observed for all the conducting samples with the maximum Hall angle appearing for NdRuO₃. The topological Hall effect observed for NdRuO₃ gradually diminishes with increasing the doping concentrations x and y.