Low Temperature Physics: 44, 962 (2018); https://doi.org/10.1063/1.5052685
Fizika Nizkikh Temperatur: Volume 44, Number 9 (September 2018), p. 1227-1232    ( to contents , go back )

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

V.A. Desnenko1, V.A. Sirenko1, I.O. Troyanchuk2, А.V. Fedorchenko1, and A.V. Yeremenko1

1B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauky Ave., Kharkiv 61103, Ukraine
E-mail: sirenko@ilt.kharkov.ua

2Scientific-Practical Materials Research Centre of Belarus, NAS, 19 P. Brovka Str., Minsk 220072, Belarus

Received May 15, 2018, published online July 26, 2018

Abstract

Low temperature relaxation of magnetization in ceramics of Pr0.4Bi0.3Ca0.3MnO3 is measured after cooling in a magnetic field and aging at temperatures 5–38 K in the vicinity of magnetic ordering transition. It is found, that at the first stage the relaxation process is of a thermoactivation character, described in terms of the Arrhenius equation. Corresponding activation energy is Q ~ 1.1 meV, which is comparable with energy of antiferromagnetic interaction in such compound. At the second stage, the dependence of relaxation rate is described by power law. Relaxation is slowing down with increase of temperature to a critical value, which agrees with formation of cluster structure in the compound under study at such conditions.

Key words: manganite, relaxation, activation energy, slowing process.

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