We present a study of the magnetization, coercivity, ac susceptibility, and magnetotransport properties of polycrystalline ${\mathrm{Nd}}_{1-x}{\mathrm{Sr}}_x{\mathrm{CoO}}_3(0<x<0.6)$. The magnetic phase diagram is dominated by a crossover from a semiconducting spin/cluster-glasslike phase at $x<0.18$ to a phase dominated by long-range ferrimagnetic order and metallic behavior at $x>0.18$. Aside from the fact that the Nd sublattice orders antiferromagnetically with respect to the Co sublattice giving rise to ferrimagnetism at low temperatures, the phase behavior is remarkably similar to that of the ${\mathrm{La}}_{1-x}{\mathrm{Sr}}_x{\mathrm{CoO}}_3$ system in all respects. We suggest that this similarity, which is our major finding, derives from the fact that both systems exhibit magnetoelectronic phase separation and that the formation of ferromagnetic clusters, which has recently been experimentally verified in ${\mathrm{La}}_{1-x}{\mathrm{Sr}}_x{\mathrm{CoO}}_3$, dominates the phase behavior.

• Received 10 June 2004

DOI:https://doi.org/10.1103/PhysRevB.70.214414