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

• Authors: I. Troyanchuk , V. Khomchenko , M. Tovar , H. Szymczak , K. Bärner
• Languages of publication: 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

75.30.Kz; 75.47.Lx; 61.50.Ks

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)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2004
• Volume: 105
• Issue: 1-2
• Pages: 27-44

Dates

published

2004-01/02

received

2003-09-15

Contributors

author

I. Troyanchuk

• Institute of Solid State and Semiconductor Physics, National Academy of Sciences, P. Brovka str. 17, 220072 Minsk, Belarus

author

V. Khomchenko

• Institute of Solid State and Semiconductor Physics, National Academy of Sciences, P. Brovka str. 17, 220072 Minsk, Belarus

author

M. Tovar

• Hahn-Meitner-Institute (BENSC), Glienickerstr. 100, 14109 Berlin, Germany

author

H. Szymczak

• Institute of Physics, Polish Academy of Sciences, al. Lotników 32/46, 02-668 Warsaw, Poland

author

K. Bärner

• IY. Physikalisches Institut der Universität Göttingen, Bunsenstrasse 13-15, 37073 Göttingen, Germany

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Identifiers

DOI

10.12693/APhysPolA.105.27