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dc.contributor.authorSHVETS, IGORen
dc.contributor.authorMURPHY, SHANEen
dc.contributor.authorMARIOTTO, GUIDOen
dc.date.accessioned2010-07-15T10:32:07Z
dc.date.available2010-07-15T10:32:07Z
dc.date.issued2003en
dc.date.submitted2003en
dc.identifier.citationShvets, I. V.; Berdunov, N.; Mariotto, G.; Murphy, S., Formation of the strain-induced electronic superstructure on the magnetite (111) surface, Europhysics Letters, 63, 6, 2003, 867-873en
dc.identifier.otherYen
dc.identifier.urihttp://hdl.handle.net/2262/40376
dc.descriptionPUBLISHEDen
dc.description.abstractWe present direct experimental evidence of the formation of a superstructure on the (111) surface of a magnetite, Fe3O4 single crystal. The superstructure, which has a periodicity of 42A and three-fold symmetry, has been observed by means of STM and LEED. Under the correct conditions of oxygen pressure and sample anneal temperature, the superstructure is reproducibly formed throughout most of the sample surface. Clear atomic resolution within the superstructure has been achieved. The characteristics of the superstructure, includingits dependency on the tunnel bias voltage and its atomic-scale periodicity, suggest that it is an electronic effect rather than a mosaic of several iron oxide phases. We explain the results in terms of the formation of giant static polarons, although we notice that other types of electronlattice instabilities such as charge density wave may offer possible explanations. Polarons with dimensions of many interatomic distances in three-dimensional systems are unlikely to exist but the situation for two- and one-dimensional cases is predicted to be different. We suggest three possible scenarios of instability linkingthe electron band structure and lattice distortions in magnetite: either resulting from reallocation of Fe2+ and Fe3+ valence states between octahedral sites or, alternatively, from reallocation between octahedral and tetrahedral sites.en
dc.description.sponsorshipThisworkwas supported by the Science Foundation ofIreland under contract 00/PI.1/C042.en
dc.format.extent867-873en
dc.language.isoenen
dc.relation.ispartofseriesEurophysics Lettersen
dc.relation.ispartofseries63en
dc.relation.ispartofseries6en
dc.rightsYen
dc.subjectAtomic, molecular and chemical physicsen
dc.subjectLEED analysisen
dc.titleFormation of the strain-induced electronic superstructure on the magnetite (111) surfaceen
dc.typeJournal Articleen
dc.contributor.sponsorScience Foundation Ireland (SFI)en
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/ivchvetsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/mariotlen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/shmurphyen
dc.identifier.rssinternalid30533en
dc.identifier.rssurihttp://iopscience.iop.org/0295-5075/63/6/867/fulltexten


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