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Journal Article

Possible absence of trimeron correlations above the Verwey temperature in Fe3O4

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Komarek,  A. C.
Alexander Komarek, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Guo,  H.
Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Elnaggar, H., Wang, R., Lafuerza, S., Paris, E., Komarek, A. C., Guo, H., et al. (2020). Possible absence of trimeron correlations above the Verwey temperature in Fe3O4. Physical Review B, 101(8): 085107, pp. 1-5. doi:10.1103/PhysRevB.101.085107.


Cite as: https://hdl.handle.net/21.11116/0000-0005-BA39-A
Abstract
The origin of the metal to insulator transition in Fe3O4 remains a challenge due to the complexity of the system: it is a mixed valent, strongly correlated system where many interactions such as Jahn-Teller distortion, exchange, and phonons are very close in energetics. A recent interpretation of the Verwey transition as an ordering of a three-site magnetic polaron, the trimeron, has been put forward. Here we investigate the existence of the trimeron correlations in the high-temperature phase of Fe3O4 using high-resolution iron 2p3d resonant inelastic scattering magnetic linear dichroism. Guided by theoretical simulations, we reveal that the polarization dependence of the low-energy spin-orbital excitations is incompatible with tetragonal Jahn-Teller trimeron-type distortion. We conclude that the lowest-energy state of the high-temperature phase of Fe3O4 arises from an intricate interplay between trigonal crystal-field, exchange, and spin-orbit interactions.