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The high temperature ferromagnetism in Sr3YCo4O10+delta perovskite, whoseorigin has been the subject of a considerable debate, has been studied byneutron powder diffraction and synchrotron X-ray diffraction measurements.Oxygen vacancy ordering creates a complex pattern of zigzag stripes in theoxygen-deficient CoO4+delta layers, where the Co ions are found in threedistinct coordinations. The symmetry of this unprecedented structuralmodulation, in conjunction with the existence of different Co spin states,provide a straightforward explanation for the appearance of ferrimagnetism. Amodel for the magnetic structure compatible with these structural features isproposed, based on the refinement of powder neutron data. The macroscopicmoment as a function of temperature that can be calculated from the values ofthe ordered spins extracted from refinements, is in excellent agreement withbulk magnetization. Unlike previous models, a collinear G-type magneticstructure with uncompensated moments due to distinct spin-states of Co imposedby different coordination is found.

Complex room temperature ferrimagnetism induced by zigzag oxygen-vacancy stripes in Sr3YCo4O10.72