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The synthesis and structural study of the stoichiometric perovskiteLa0.5Ba0.5CoO3 have allowed three forms to be isolated. Besides the disorderedLa0.5Ba0.5CoO3 and the perfectly ordered layered LaBaCo2O6, a third form callednanoscale-ordered LaBaCo2O6, is obtained. As evidenced by transmission electronmicroscopy investigations, the latter consists of 112-type 90 degree orienteddomains fitted into each other at a nanometer scale which induce large strainsand consequently local atomic scale lattice distortions. These threeferromagnetic perovskites exhibit practically the same Tc (174-179 K), butdifferently from the other phases, the nanoscale-ordered LaBaCo2O6 is a hardferromagnet, with Hc = 4.2 kOe, due to the strains which may pin domain walls,preventing the reversal of the spins in a magnetic field. The magnetotransportproperties of these phases show that all of them exhibit a maximum intrinsicmagnetoresistance, close to 6-7 % around Tc under 70 kOe but that the orderedphase exhibits a much higher tunnelling magnetoresistance effect at lowtemperature of about 15 % against 4 % due to the grain boundary effects.

Cationic Ordering and Microstructural Effects in the Ferromagnetic Perovskite La0.5Ba0.5CoO3: Impact upon Magnetotransport Properties