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2004 | 105 | 1-2 | 27-44
Article title

Orbital Correlations and Magnetic Phase Transitions in Lightly Doped La_{0.88}MnO_x and LaMn_{0.94}O_y Manganites

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EN
Abstracts
EN
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.
Keywords
EN
Year
Volume
105
Issue
1-2
Pages
27-44
Physical description
Dates
published
2004-01/02
received
2003-09-15
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Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv105n101kz
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