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Abstracts
The results of X-ray and neutron diffraction study as well as the elastic, magnetic, and electrotransport properties of La_{0.88}MnO_x (2.82≤ x≤2.96) and LaMn_{0.94}O_y (2.91≤ y≤3.00)$ manganites have been presented. Under oxygen doping, the transitions from antiferromagnetic to ferromagnetic or spin-glass state are observed for La-deficient and La-excessive series, respectively. These transitions have been found to correlate with the change of the type of Jahn-Teller distortions from static to dynamic ones. The dynamic orbital correlations favor a ferromagnetic state, while an A-type antiferromagnetic state is typical of the static Jahn-Teller distortions. It is argued that the canting magnetic structure in manganites is not realized. The transition to a ferromagnetic or spin-glass state occurs via the formation of inhomogeneous state with different types of orbital correlations and magnetic structure. The key role of intrinsic chemical inhomogeneity in the formation of inhomogeneous magnetic states in solid solutions of manganites is emphasized.
Discipline
- 61.50.Ks: Crystallographic aspects of phase transformations; pressure effects(see also 81.30.Hd in materials science)
- 75.47.Lx: Magnetic oxides
- 75.30.Kz: Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.)(for ferroelectric phase transitions, see 77.80.B-; for superconductivity phase diagrams, see 74.25.Dw)
Journal
Year
Volume
Issue
Pages
27-44
Physical description
Dates
published
2004-01/02
received
2003-09-15
Contributors
author
- Institute of Solid State and Semiconductor Physics, National Academy of Sciences, P. Brovka str. 17, 220072 Minsk, Belarus
author
- Institute of Solid State and Semiconductor Physics, National Academy of Sciences, P. Brovka str. 17, 220072 Minsk, Belarus
author
- Hahn-Meitner-Institute (BENSC), Glienickerstr. 100, 14109 Berlin, Germany
author
- Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland
author
- IY. Physikalisches Institut der Universität Göttingen, Bunsenstrasse 13-15, 37073 Göttingen, Germany
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv105n101kz