Journal
PHYSICAL REVIEW B
Volume 88, Issue 16, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.88.161410
Keywords
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Funding
- Spanish Government [MAT2009-14578-C03-01, MAT2012-38045-C04-01]
- Office of Basic Energy Sciences, Division of Materials and Engineering Sciences, US Department of Energy [AC0205CH11231]
- Centre for Atomic-Level Catalyst Design, an Energy Frontier Research Centre
- US Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001058]
- NSF [DMR-1205469]
- Austrian Science Fund [P24925-N20]
- Austrian Science Fund (FWF) [P24925] Funding Source: Austrian Science Fund (FWF)
- Austrian Science Fund (FWF) [P 24925] Funding Source: researchfish
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Effects 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 TV, the initially flat surface undergoes a rooflike distortion with a periodicity of similar to 0.5 mu m 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 (root 2 x root 2)R45 degrees 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 (root 2 x root 2)R45 degrees reconstruction. Although conceptually similar, the charge-ordered phases of the (100) surface and sub-T-V bulk of magnetite are unrelated phenomena.
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