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Response of the Charge Subsystem to Phase Transitions in Double Manganites LnBaMn2O6
- Authors: Mostovshchikova E.V1, Sterkhov E.V2, Pyzh'yanov Y.Y.1, Titova S.G2
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Affiliations:
- Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
- Pyzhyanov Institute of Metallurgy, Ural Branch, Russian Academy of Sciences
- Issue: Vol 163, No 1 (2023)
- Pages: 58-65
- Section: Articles
- URL: https://journals.rcsi.science/0044-4510/article/view/145475
- DOI: https://doi.org/10.31857/S0044451023010078
- EDN: https://elibrary.ru/NNNOXK
- ID: 145475
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Abstract
We study the structural, magnetic, and optical properties of double manganites LnBaMn2O6 with Ln = Pr, Nd, Sm, Nd1 – xSmx (x = 0.25, 0.5, 0.75). Analysis of the temperature dependences of transmission in the near IR range has shown the difference in the responses of the charge subsystem for different types of charge/orbital ordering in the system. In PrBaMn2O6 manganite, the orbital ordering of the dx2−y2 type leads to an insulator state at low temperatures. The charge subsystem of manganites NdBaMn2O6, Nd0.75Sm0.25BaMn2O6, and Nd0.5Sm0.5BaMn2O6 is sensitive to the orbital ordering type: in the temperature interval TCO2 < T < TCO1, where pairwise alignment of layers with d3x2−r2/d3y2−r2 ordered orbitals is realized, the semiconductor character of charge carriers is observed, while upon a transition to the layer-by-layer alignment of orbitally ordered layers for T < TCO2, charge carriers are of the metal character. In manganites Nd0.25Sm0.75BaMn2O6 and SmBaMn2O6, the absence of clearly manifested metal nature of the charge subsystem at T < TCO2 is associated with the formation of the antiferromagnetic ordering of the CE type.
About the authors
E. V Mostovshchikova
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: mostovsikova@imp.uran.ru
620108, Yekaterinburg, Russia
E. V Sterkhov
Pyzhyanov Institute of Metallurgy, Ural Branch, Russian Academy of Sciences
Email: mostovsikova@imp.uran.ru
620016, Yekaterinburg, Russia
Ya. Ya Pyzh'yanov
Mikheev Institute of Metal Physics, Ural Branch, Russian Academy of Sciences
Email: mostovsikova@imp.uran.ru
620108, Yekaterinburg, Russia
S. G Titova
Pyzhyanov Institute of Metallurgy, Ural Branch, Russian Academy of Sciences
Author for correspondence.
Email: mostovsikova@imp.uran.ru
620016, Yekaterinburg, Russia
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