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The complex nature of the magnetic ground state in La$_{1-x}$A$_{x}$CoO$_{3}$(A = Ca, Sr, Ba) has been investigated via neutron scattering. It waspreviously observed that ferromagnetic (FM) as well as antiferromagnetic (AFM)correlations can coexist prior to the insulator-metal transition (IMT). Wefocused on a unique region in the Ba phase diagram, from x = 0.17 - 0.22, inwhich a commensurate AFM phase appears first with a propagation vector, k = (0,-0.5, 0.5), and the Co moment in the (001)$_{R}$ plane of the rhombohedrallattice. With increasing x, the AFM component weakens while an FM order appearswith the FM Co moment directed along the (001)$_{R}$ (=(111)$_{C}$) axis. By x= 0.22, a spin flip to new FM component appears as the crystal fully transformsto an orthorhombic (Pnma) structure, with the Co moments pointing along a newdirection, (001)$_{O}$ (=(110)$_{C}$). It is the emergence of the magnetic Pnmaphase that leads to IMT.

Possible link of a structurally driven spin flip transition and the insulator-metal transition in the perovskite La$_{1-x}$Ba$_{x}$CoO$_{3}$