Interest in the transition metal oxides with perovskite related structures goes back to the 1950s when the sodium tungsten bronzes NaxWO3 were shown to be metallic 1 ], the system Lal_xSr MnO3 was found to contain a ferromagnetic conductive phase 2], and La0.sSr0.sCoO3 was reported to be a ferromagnetic metal, but with a peculiar magnetization of 1.5 #a/Co atom 3]. Stoichiometric oxide perovskites have the generic formula AMO3 in which the A site...
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