Low-temperature relaxation of magnetization in manganite Pr0.4Bi0.3Ca0.3MnO3

LOW TEMPERATURE PHYSICS(2018)

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摘要
Low-temperature relaxation of magnetization in Pr0.4Bi0.3Ca0.3MnO3 ceramics was measured after cooling in a magnetic field and aging at temperatures from 5 K to 38 K near the transition temperature to the magnetically ordered state. It was found that the relaxation process has a thermoactivation character at the first stage and is described in terms of the Arrhenius equation. Its activation energy Q approximate to 1.1 meV is comparable with the antiferromagnetic interaction energy in this compound. The temperature-time dependence of the relaxation rate at the second stage is described by a power law. The relaxation slows down as the temperature approaches the critical value, which may be associated with the formation of a cluster structure in the studied compound under these conditions. Published by AIP Publishing.
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关键词
manganite pr<sub>04</sub>bi<sub>03</sub>ca<sub>03</sub>mno<sub>3</sub>,magnetization,low-temperature
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