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Possible absence of trimeron correlations above the Verwey temperature in Fe3O4

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 th...

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Hauptverfasser: Elnaggar, Hebatalla (VerfasserIn) , Haverkort, Maurits W. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 6 February 2020
In: Physical review
Year: 2020, Jahrgang: 101, Heft: 8, Pages: 1-5
ISSN:2469-9969
DOI:10.1103/PhysRevB.101.085107
Online-Zugang:Verlag, Volltext: https://doi.org/10.1103/PhysRevB.101.085107
Verlag: https://link.aps.org/doi/10.1103/PhysRevB.101.085107
Volltext
Verfasserangaben:H. Elnaggar, R. Wang, S. Lafuerza, E. Paris, A.C. Komarek, H. Guo, Y. Tseng, D. McNally, F. Frati, M.W. Haverkort, M. Sikora, T. Schmitt, and F.M.F. de Groot

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520 |a 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. 
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