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  Verwey-type charge ordering transition in an open-shell p-electron compound

Adler, P., Jeglič, P., Reehuis, M., Geiß, M., Merz, P., Knaflič, T., et al. (2018). Verwey-type charge ordering transition in an open-shell p-electron compound. Science Advances, 4(1): eaap7581, pp. 1-7. doi:10.1126/sciadv.aap7581.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-31E4-7 Version Permalink: http://hdl.handle.net/21.11116/0000-0000-31F0-9
Genre: Journal Article

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 Creators:
Adler, Peter1, Author              
Jeglič, Peter2, Author
Reehuis, Manfred2, Author
Geiß, Matthias2, Author
Merz, Patrick3, Author              
Knaflič, Tilen2, Author
Komelj, Matej2, Author
Hoser, Andreas2, Author
Sans, Annette3, Author              
Janek, Jürgen2, Author
Arčon, Denis2, Author
Jansen, Martin3, Author              
Felser, Claudia4, Author              
Affiliations:
1Peter Adler, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863435              
2External Organizations, escidoc:persistent22              
3Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863425              
4Claudia Felser, Inorganic Chemistry, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, escidoc:1863429              

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 Abstract: The Verwey transition in Fe3O4, a complex structural phase transition concomitant with a jump in electrical conductivity by two orders of magnitude, has been a benchmark for charge ordering (CO) phenomena in mixed-valence transition metal materials. CO is of central importance, because it frequently competes with functional properties such as superconductivity or metallic ferromagnetism. However, the CO state in Fe3O4 turned out to be complex, and the mechanism of the Verwey transition remains controversial. We demonstrate an archetypical Verwey-type transition in an open p-shell anionic mixed-valence compound using complementary diffraction and spectroscopic techniques. In Cs4O6, a phase change from a cubic structure with a single crystallographic site for the molecular O2x- building units to a tetragonal structure with ordered superoxide O2- and peroxide O22- entities is accompanied by a drastic drop in electronic conductivity and molecular charge fluctuation rates. The simple CO pattern of molecular units and the lack of magnetic order suggest Cs4O6 as a model system for disentangling the complex interplay of charge, lattice, orbital, and spin degrees of freedom in Verwey-type CO processes.

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Language(s): eng - English
 Dates: 2018-01-192018-01-19
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: -
 Identifiers: DOI: 10.1126/sciadv.aap7581
 Degree: -

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Title: Science Advances
  Other : Sci. Adv.
Source Genre: Journal
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Publ. Info: Washington : AAAS
Pages: - Volume / Issue: 4 (1) Sequence Number: eaap7581 Start / End Page: 1 - 7 Identifier: ISSN: 2375-2548
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/2375-2548