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Inverse Jahn-Teller transition in bimetallic oxalates
Randy S Fishman1, Satoshi Okamoto, Fernando A Reboredo
1Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6065, USA.
Low temperatures may restore an undistorted phase in iron bimetallic oxalates due to competing spin-orbit coupling and Jahn-Teller effects. Evidence supports an inverse Jahn-Teller transition below the ferrimagnetic temperature.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Chemistry
Background:
- Fe(II)Fe(III) bimetallic oxalates exhibit complex magnetic and structural properties.
- Spin-orbit coupling and Jahn-Teller (JT) effects are key interactions influencing these materials.
- Understanding the interplay between these interactions is crucial for predicting material behavior.
Purpose of the Study:
- To theoretically predict the structural phase behavior of Fe(II)Fe(III) bimetallic oxalates at low temperatures.
- To investigate the competition between spin-orbit coupling and Jahn-Teller energies.
- To elucidate the presence and nature of Jahn-Teller transitions relative to magnetic transitions.
Main Methods:
- Theoretical prediction using first-principles calculations.
- Analysis of spin-orbit coupling and Jahn-Teller energies.
- Comparison with existing experimental measurements.
Main Results:
- A theoretical prediction of an undistorted phase with C3 symmetry at each Fe site under specific conditions.
- Prediction of both lower and upper Jahn-Teller transitions occurring around the ferrimagnetic transition temperature (Tc).
- Strong evidence for an inverse Jahn-Teller transition below Tc in compounds showing magnetic compensation.
Conclusions:
- The competition between spin-orbit coupling and Jahn-Teller energies can lead to unique structural phases in Fe(II)Fe(III) bimetallic oxalates.
- Jahn-Teller transitions are shown to bracket the magnetic ordering temperature, influencing the material's properties.
- An inverse Jahn-Teller transition below Tc is strongly supported, offering new insights into the magnetostructural coupling in these systems.
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