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Helicoidal ordering in iron perovskites.

Maxim Mostovoy¹

¹Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.

Physical Review Letters

|May 21, 2005

Summary

The study reveals how charge transfer energy and oxygen hopping influence magnetic ordering in transition metal oxides. Negative charge transfer energy with significant oxygen hopping leads to helical magnetic structures, explaining differences between ferrates and manganites.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid-State Chemistry

Background:

Transition metal oxides exhibit complex magnetic and electronic properties due to the interplay of itinerant and localized electrons.
The double exchange mechanism is crucial for understanding magnetism in these materials.

Purpose of the Study:

To investigate the impact of charge transfer energy (Delta) and oxygen-oxygen hopping (t(pp)) on magnetic ordering in transition metal oxides.
To elucidate the microscopic origins of differing magnetic and transport properties in related material classes like ferrates and manganites.

Main Methods:

Theoretical study of the double exchange model in transition metal oxides.
Analysis of the influence of key electronic parameters on magnetic ground states.

Main Results:

Ferromagnetic ordering is favored for positive charge transfer energy (Delta > 0).
Incommensurate helicoidal magnetic ordering arises for negative Delta and large t(pp), as observed in SrFeO3 and CaFeO3.
Metal-insulator transitions into charge-ordered states minimally affect magnetic ordering for negative Delta.

Conclusions:

The interplay between charge transfer energy and oxygen hopping dictates the magnetic ground state of transition metal oxides.
The model successfully explains the distinct magnetic behaviors of iron perovskites (ferrates) and manganites.

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