TY - JOUR
T1 - Real-space imaging of the Verwey transition at the (100) surface of magnetite
AU - De La Figuera, Juan
AU - Novotny, Zbynek
AU - Setvin, Martin
AU - Liu, Tijiang
AU - Mao, Zhiqiang
AU - Chen, Gong
AU - N'Diaye, Alpha T.
AU - Schmid, Michael
AU - Diebold, Ulrike
AU - Schmid, Andreas K.
AU - Parkinson, Gareth S.
PY - 2013/10/29
Y1 - 2013/10/29
N2 - 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 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.
AB - 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 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.
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U2 - 10.1103/PhysRevB.88.161410
DO - 10.1103/PhysRevB.88.161410
M3 - Article
AN - SCOPUS:84887056174
SN - 1098-0121
VL - 88
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 16
M1 - 161410
ER -