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A new nanoscale ordered perovskite cobaltite, which consists of 90 degreeordered domains of the layered-112 LaBaCo2O6 has been evidenced by highresolution- transmission electron microscopy. This new form, like thedisordered La0.5Ba0.5CoO3 and ordered LaBaCo2O6, exhibits a ferromagnetictransition at TC around 179 K. However, it differs from the two previous formsby its strong magnetic anisotropy, and correlatively by its high value ofcoercivity (0.42 Tesla) at low temperature. We suggest that this behaviouroriginates from the locking of magnetic spins in the 90 degree orientednano-domain. Moreover, one observes a semi-metal/semi-metal transition at TCwith a maximum magnetoresistance of 6.5 % at this temperature.

Spin-locking effect in the nanoscale ordered perovskite cobaltite LaBaCo2O6