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Real-space imaging of the Verwey transition at the (100) surface of magnetite

Authorsde la Figuera, Juan CSIC ORCID CVN; Novotny, Zbynek; Setvin, Martin; Liu, Tijiang; Mao, Zhiqiang; Chen, Gong; N’Diaye, Alpha T.; Schmid, Michael; Diebold, Ulrike; Schmid, Andreas K.; Parkinson, Gareth S.
Issue Date29-Oct-2013
PublisherAmerican Institute of Physics
CitationPhysical Review B - Condensed Matter and Materials Physics 88 (2013)
AbstractEffects of the Verwey transition on the (100) surface of magnetite were studied using scanning tunneling microscopy and spin polarized low-energy electron microscopy. On cooling through the transition temperature T V, the initially flat surface undergoes a rooflike distortion with a periodicity of ∼0.5 μm due to ferroelastic twinning within monoclinic domains of the low-temperature monoclinic structure. The monoclinic c axis orients in the surface plane, along the [001]c directions. At the atomic scale, the charge-ordered (√2×√2)R45 â̂̃ reconstruction of the (100) surface is unperturbed by the bulk transition, and is continuous over the twin boundaries. Time resolved low-energy electron microscopy movies reveal the structural transition to be first order at the surface, indicating that the bulk transition is not an extension of the Verwey-like (√2×√2)R45 â̂̃ reconstruction. Although conceptually similar, the charge-ordered phases of the (100) surface and sub-TV bulk of magnetite are unrelated phenomena. © 2013 American Physical Society.
Description5 pags, 4 figs
Publisher version (URL)
Identifiersdoi: 10.1103/PhysRevB.88.161410
issn: 1098-0121
Appears in Collections:(IQFR) Artículos

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