Ageing Phenomena in La-Sr Manganites with Divalent Substituents for Manganese

• Authors: D. Merkulov , A. Badelin , S. Estemirova , V. Karpasyuk
• Languages of publication: EN

Abstracts

EN

Variations of electromagnetic and structural characteristics of La_{1-c+x}Sr_{c-x}Mn_{1-x}Me_{x}O_{3+γ} manganites (Me = Zn, Ni) during storage time up to 36000 hours at room temperature and after frequentative thermal cycling in the 300-573 K range were investigated. Changes of magnetization of all samples were within the error of measurement. In most cases Curie point (T_{C}) showed irregular variations within the range of 20%, while zinc-substituted manganites with relatively high values of "c" exhibited some trend of T_{C} rise. The resistance of all samples increased during storage period. The cell volume of single-phase manganites decreased over time, that may indicates an increase in oxygen content. However, the sample with the highest Ni content (x=0.125) at c=0.19 suffered phase transition "rhombohedral-orthorhombic structures", which cannot be explained by the oxygen absorption. Probably, this effect was due to the rearrangement of the ions and vacancies between crystal sublattices of manganite.

Keywords

EN

75.30.-m; 75.47.-m; 75.47.Lx; 81.70.-q

Discipline

• 75.30.-m: Intrinsic properties of magnetically ordered materials(for critical point effects, see 75.40.-s; for magnetotransport phenomena, see 75.47.-m)
• 81.70.-q: Methods of materials testing and analysis(see also 82.80.-d Chemical analysis and related physical methods of analysis)
• 75.47.-m: Magnetotransport phenomena; materials for magnetotransport(for spintronics, see 85.75.-d; see also 72.25.-b Spin polarized transport; 72.15.Gd Galvanomagnetic and other magnetotransport effects; for magnetotransport effects in thin films, see 73.50.Jt; see also 73.43.Qt Magnetoresistance)
• 75.47.Lx: Magnetic oxides

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2018
• Volume: 133
• Issue: 3
• Pages: 529-531

Dates

published

2018-03

Contributors

author

D. Merkulov

• Astrakhan State University, Tatishchev str. 20a, 414056 Astrakhan, Russia

author

A. Badelin

• Astrakhan State University, Tatishchev str. 20a, 414056 Astrakhan, Russia

author

S. Estemirova

• Institute for Metallurgy, UB Russian Academy of Sciences, Amundsen str. 101, 620016 Yekaterinburg, Russia

author

V. Karpasyuk

• Astrakhan State University, Tatishchev str. 20a, 414056 Astrakhan, Russia

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Identifiers

DOI

10.12693/APhysPolA.133.529