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  Anharmonicity due to Electron-Phonon Coupling in Magnetite

Hoesch, M., Piekarz, P., Bosak, A., Le Tacon, M., Krisch, M., Kozlowski, A., et al. (2013). Anharmonicity due to Electron-Phonon Coupling in Magnetite. Physical Review Letters, 110(20): 207204.

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Hoesch, M., Author
Piekarz, P., Author
Bosak, A., Author
Le Tacon, M.1, Author           
Krisch, M., Author
Kozlowski, A., Author
Oleś, A. M.2, Author           
Parlinski, K., Author
Affiliations:
1Solid State Spectroscopy, Max Planck Institute for Solid State Research, Max Planck Society, ou_persistent22              
2Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society, ou_3370486              

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 Abstract: We present the results of inelastic x-ray scattering for magnetite and analyze the energies and widths of the phonon modes with different symmetries in a broad range of temperature 125 < T < 293 K. The phonon modes with X-4 and Delta(5) symmetries broaden in a nonlinear way with decreasing T when the Verwey transition is approached. It is found that the maxima of phonon widths occur away from high-symmetry points, which suggests the incommensurate character of critical fluctuations. Strong phonon anharmonicity induced by electron-phonon coupling is discovered by a combination of these experimental results with ab initio calculations which take into account local Coulomb interactions at Fe ions. It (i) explains observed anomalous phonon broadening and (ii) demonstrates that the Verwey transition is a cooperative phenomenon which involves a wide spectrum of phonons coupled to the electron charge fluctuations condensing in the low-symmetry phase.

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Language(s): eng - English
 Dates: 2013
 Publication Status: Issued
 Pages: -
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 Table of Contents: -
 Rev. Type: Internal
 Identifiers: eDoc: 672277
ISI: 000319062300025
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Title: Physical Review Letters
Source Genre: Journal
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Pages: - Volume / Issue: 110 (20) Sequence Number: 207204 Start / End Page: - Identifier: ISSN: 0031-9007