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Cation, magnetic, and charge ordering in MnFe3O5.
K H Hong1, A M Arevalo-Lopez2, M Coduri3
1Centre for Science at Extreme Conditions and School of Chemistry , University of Edinburgh , Mayfield Road , Edinburgh EH9 3JZ , UK .
Journal of Materials Chemistry. C
|July 17, 2018
Summary
The high-pressure material MnFe3O5 exhibits complex magnetic ordering transitions upon cooling, including antiferromagnetic and ferrimagnetic states, alongside charge ordering. Electrical resistivity measurements show semiconducting behavior with a notable change in activation energy.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- High-pressure materials offer unique physical properties.
- Understanding complex magnetic ordering is crucial for novel electronic applications.
Purpose of the Study:
- To investigate the magnetic and electrical properties of the newly discovered high-pressure material MnFe3O5.
- To elucidate the sequence and nature of magnetic transitions and their correlation with charge ordering.
Main Methods:
- Magnetic susceptibility measurements to identify magnetic transitions.
- Neutron diffraction to determine magnetic structures.
- Electrical resistivity measurements to probe electronic transport properties.
Main Results:
- MnFe3O5 exhibits multiple magnetic transitions upon cooling: antiferromagnetic Fe spin ordering at 350 K, Mn spin ordering and ferrimagnetism at 150 K, and further spin canting driven by charge ordering at 60 K.
- Charge ordering of Fe2+ and Fe3+ occurs at 60 K over inequivalent Fe sites.
- Electrical resistivity measurements reveal semiconducting behavior with a change in activation energy at 285 K.
Conclusions:
- MnFe3O5 displays a rich phase diagram with coupled magnetic and charge ordering phenomena.
- The interplay between spin and charge degrees of freedom in MnFe3O5 leads to complex magnetic states.
- The semiconducting nature and distinct transitions suggest potential for applications in electronic devices.
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