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Spin, charge, and orbital ordering in complex magnetic oxides

Ziel

The project seeks to reveal the relation between different types of ordering in complex magnetic oxides and the physical mechanisms determining their structural, magnetic and transport properties. A special emphasis will be made on the compounds where the transition points corresponding to different types of ordering are close to each other and small composition changes (including isotope substitution) or relatively weak applied fields can produce rather pronounced effects.

The research efforts will be concentrated on the following tasks:
(i) the study of isotope substitution effect on phase transitions in the manganites with competing order parameters;
(ii) the studies of transport and magnetic properties of complex magnetic oxides in the vicinity of phase transition points;
(iii) the study of interrelated transport, magnetic, and structural characteristics of complex magnetic oxides in different regions of the phase diagram.

The performing of these tasks will involve
- synthesis of mixed rare-earth manganites in the form of epitaxial films, ceramics, and powders (including the isotope substitution);
- characterizing of crystal and magnetic structure of the samples by X-ray diffraction, neutron scattering, muon spin rotation, and optical methods;
- measurements of dc conductivity, current-voltage characteristics, ac magnetic susceptibility, and dc magnetisation as function of temperature and magnetic field with the emphasis on the isotope effect and especially on the metal-insulator transition induced by the isotope substitution;
- interpretation of experimental data in the framework of microscopic models accounting for the electron-lattice coupling (manifesting itself in large isotope effect), strong electron correlations resulting in spin-electron interaction, charge, orbital, and magnetic ordering.

As a result, it is expected to find out the mechanisms of large isotope effect in perovskite manganites, the nature of nonlinear phenomena and other anomalies related to competing order parameters, the charge transfer mechanisms and their relation in different regions of the phase diagram. These results should provide a clue to understanding the interplay of structural, magnetic, and transport properties in the situation with strong electron-electron correlations accompanied by a pronounced electron-lattice coupling.
As a result, it is expected to find out the mechanisms of large isotope effect in perovskite manganites, the nature of nonlinear phenomena and other anomalies related to competing order parameters, the charge transfer mechanisms and their relation in different regions of the phase diagram. These results should provide a clue to understanding the interplay of structural, magnetic, and transport properties in the situation with strong electron-electron correlations accompanied by a pronounced electron-lattice coupling.

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University of Cambridge
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Adresse
Madingley Road
CB3 0HE Cambridge
Vereinigtes Königreich

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Beteiligte (6)

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Letzte Aktualisierung: 30 Oktober 2002

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Permalink: https://cordis.europa.eu/project/id/INTAS-1997-00963/de

European Union, 2024