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Related Experiment Video

Updated: Apr 25, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Anharmonicity due to electron-phonon coupling in magnetite.

Moritz Hoesch¹, Przemysław Piekarz², Alexey Bosak³

¹Diamond Light Source, Harwell Campus, Didcot OX11 0DE, Oxfordshire, United Kingdom.

Physical Review Letters

|August 29, 2014

Summary

Inelastic X-ray scattering reveals strong electron-phonon coupling in magnetite. This coupling drives the Verwey transition, a cooperative phenomenon involving critical fluctuations and anomalous phonon broadening.

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Area of Science:

Condensed Matter Physics
Materials Science
Solid State Physics

Background:

Magnetite (Fe3O4) exhibits a metal-insulator transition known as the Verwey transition.
Understanding the underlying mechanisms of this transition is crucial for materials science applications.

Purpose of the Study:

To investigate phonon behavior in magnetite near the Verwey transition.
To elucidate the role of electron-phonon coupling in this transition.

Main Methods:

Inelastic X-ray scattering experiments were performed on magnetite across a temperature range of 125-293 K.
Ab initio calculations incorporating local Coulomb interactions at Fe ions were utilized.

Main Results:

Phonon modes with X(4) and Δ(5) symmetries showed nonlinear broadening as the Verwey transition temperature was approached.
Phonon width maxima occurred away from high-symmetry points, indicating incommensurate critical fluctuations.
Strong phonon anharmonicity due to electron-phonon coupling was identified.

Conclusions:

The observed anomalous phonon broadening is explained by strong electron-phonon coupling.
The Verwey transition is a cooperative phenomenon involving a broad spectrum of phonons coupled to electron charge fluctuations.