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Publications in Scientific Journals:

J. de la Figuera, Z. Novotny, M. Setvin, T. Liu, Z. Mao, G. Chen, A. Diaye, M. Schmid, U. Diebold, A. Schmid, G. Parkinson:
"Real-space imaging of the Verwey transition at the (100) surface of magnetite";
Physical Review B, 88 (2013), 1614101 - 1614105.



English abstract:
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
μ
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 (

2


2)
R
45

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)
R
45

reconstruction. Although conceptually similar, the charge-ordered phases of the (100) surface and sub-
T
V
bulk
of magnetite are unrelated pheno

Created from the Publication Database of the Vienna University of Technology.