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

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dc.creatorRautama, Eeva Leena
dc.creatorBoullay, Philippe
dc.creatorKundu, Asish K.
dc.creatorCaignaert, Vincent
dc.creatorPralong, Valerie
dc.creatorKarppinen, Maarit
dc.creatorRaveau, Bernard
dc.date2008-02-27
dc.date.accessioned2026-07-07T09:32:51Z
dc.date.available2026-07-07T09:32:51Z
dc.descriptionThe synthesis and structural study of the stoichiometric perovskite La0.5Ba0.5CoO3 have allowed three forms to be isolated. Besides the disordered La0.5Ba0.5CoO3 and the perfectly ordered layered LaBaCo2O6, a third form called nanoscale-ordered LaBaCo2O6, is obtained. As evidenced by transmission electron microscopy investigations, the latter consists of 112-type 90 degree oriented domains fitted into each other at a nanometer scale which induce large strains and consequently local atomic scale lattice distortions. These three ferromagnetic perovskites exhibit practically the same Tc (174-179 K), but differently from the other phases, the nanoscale-ordered LaBaCo2O6 is a hard ferromagnet, 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 magnetotransport properties of these phases show that all of them exhibit a maximum intrinsic magnetoresistance, close to 6-7 % around Tc under 70 kOe but that the ordered phase exhibits a much higher tunnelling magnetoresistance effect at low temperature of about 15 % against 4 % due to the grain boundary effects.
dc.description26 pages, higher resolution figs (will be@chem. mat.2008)
dc.identifierhttps://arxiv.org/abs/0802.3984
dc.identifierhttp://arxiv.org/abs/0802.3984
dc.identifierChem. Mat. 20, 2742 (2008)
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/158932
dc.subjectMaterials Science
dc.titleCationic Ordering and Microstructural Effects in the Ferromagnetic Perovskite La0.5Ba0.5CoO3: Impact upon Magnetotransport Properties
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