期刊
JOURNAL OF MATERIALS CHEMISTRY
卷 18, 期 36, 页码 4280-4285出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/b806134c
关键词
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资金
- STREP MaCoMuFi [NMP3-CT-2006-033221]
- CNRS
- Ministry of Education and Research
The study of the substitution of manganese by cobalt in the perovskite (LaBi) MnO3 in view of discovering magneto- dielectric properties in manganites, has allowed the perovskite La1.2Bi0.8Mn1.2Co0.8O6.02 to be selected. This phase is indeed ferromagnetic, like the parent phase La1.2Bi0.8Mn2O6.20, yet with a much higher TC (181 K instead of 103 K). Moreover, it is a better insulator than the other members with an activation energy of 86 meV. Importantly, it exhibits a significant magneto- dielectric effect of around 0.25% at 80 K. Finally, it is also shown to exhibit magnetoresistance (MR) properties at low temperature, with MR values up to -19% at 125 K. These properties are explained on the basis of Mn4+/ Co2+ ferromagnetic interactions, electronic phase separation and spin-lattice interactions.
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