Metal-insulator transitions and magnetic ordered states in oxygen-depleted manganites
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Curso de graduação
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Elsevier B.V.
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Resumo
The use of AC/DC magnetic susceptibility and impedance measurements to detect oxygen depletion effects in La0.7Ca0.3MnO3 +/-delta and NiMn2O4+delta spinel-type compounds is reported. For the NiMn2O4, for which no Mn4+ was found, three superposed Debye relaxations were observed in the range 260-180 K. Otherwise, in La0.7Ca0.3MnO3, the argon annealed has contributed to a decrease in T-C, but the amount of Mn4+ is still too high to allow the observation of a relaxation in this frequency window. (c) 2006 Elsevier B.V. All rights reserved.
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magnetic materials, spinels, impedance
Idioma
Inglês
Citação
Physica B-condensed Matter. Amsterdam: Elsevier B.V., v. 378-80, p. 522-524, 2006.
