Abstract
Epitaxial FeSi 2 of cubic symmetry has been grown for the first time on Si(111) by solid phase epitaxy (SPE) and molecular beam epitaxy (MBE). Structural investigation by reflection high-energy electron diffraction (RHEED) and transmission electron microscopy (TEM) suggest the phase to have the same CaF 2 structure as CoSi 2 and NiSi 2. Ultraviolet photoelectron spectroscopy (UPS) and resistivity measurements show that the phase is metallic and undergoes an irreversible metal/semiconductor transition to the orthorhombic β-FeSi 2 phase at a temperature depending on the thickness of the film. Hall effect measurements have revealed holes to be the dominant carrier species. High resolution TEM studies, together with the observation of an anomalous Hall effect as well as theoretical considerations, indicate that this cubic FeSi 2 phase is magnetic, in contrast to CoSi 2 and NiSi 2.
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