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Full Record Details
Persistent URL
http://purl.org/net/epubs/work/34558
Record Status
Checked
Record Id
34558
Title
Electrostatically driven charge-ordering in Fe
2
OBO
3
Contributors
JP Attfield (Cambridge U.)
,
AMT Bell (Cambridge U.)
,
LM Rodriguez-Martinez (Cambridge U.)
,
JM Greneche (Maine U./CNRS)
,
RJ Cernik (CCLRC Daresbury Lab.)
,
JF Clarke (Oxford U.)
,
DA Perkins (Oxford U.)
Abstract
Charge-ordering is an important phenomenon in conducting metal oxides: it leads to metal-insulator transitions(1) in manganite perovskites (which show 'colossal' magnetoresistances), and the Verwey(2) transition in magnetite tin which the material becomes insulating at low temperatures when the conduction electrons freeze into a regular array). Charge-ordered 'stripes' are found in some manganites(3,4) and copper oxide superconductors(5); in the latter case, dynamic fluctuations of the stripes have been proposed(6) as a mechanism of high-temperature superconductivity. But an important unresolved issue is whether the charge-ordering in oxides is driven by electrostatic repulsions between the charges (Wigner crystallization(7)), or by the strains arising from electron-lattice interactions (such as Jahn-Teller distortions) involving different localized electronic states. Here we report measurements on iron oxoborate, Fe2OBO3, that support the electrostatic repulsion charge-ordering mechanism: the system adopts a charge-ordered state below 317 K, in which Fe2+ and Fe3+ ions are equally distributed over structurally distinct Fe sites. In contrast, the isostructural manganese oxoborate, Mn2OBO3, has been previously shown(8) to undergo charge-ordering through Jahn-Teller distortions. We therefore conclude that both mechanisms occur within the same structural arrangement.
Organisation
CCLRC
,
SRS
,
9.1
Keywords
Materials
,
Chemistry
,
Magnetite
,
Superconductors
,
Verwey tranition
Funding Information
Related Research Object(s):
Licence Information:
Language
English (EN)
Type
Details
URI(s)
Local file(s)
Year
Journal Article
Nature
396, no. 6712 (1998): 655-658.
doi:10.1038/25309
1998
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