We present a Scanning Tunneling Microscopy (STM) investigation of gold deposited at the magnetite Fe3O4(001) surface at room temperature. This surface forms a reconstruction with (\surd2\times\surd2)R45{\deg} symmetry, where pairs of Fe and neighboring O ions are slightly displaced laterally, forming undulating rows with 'narrow' and 'wide' adsorption sites. At fractional monolayer coverages, single Au adatoms adsorb exclusively at the narrow sites, with no significant sintering up to annealing temperatures of 400 {\deg}C. The strong preference for this site is possibly related to charge and orbital ordering within the first subsurface layer of the reconstructed Fe3O4(001) surface. Because of their high thermal stability, the ordered Au atoms at Fe3O4(001)- (\surd2\times\surd2)R45{\deg} could provide useful for probing the chemical reactivity of single atomic species.
@article{arxiv.1203.5850,
title = {Ordered Array of Single Au Adatoms with Remarkable Thermal Stability: Au/Fe3O4(001)},
author = {Zbyněk Novotný and Giacomo Argentero and Zhiming Wang and Michael Schmid and Ulrike Diebold and Gareth S. Parkinson},
journal= {arXiv preprint arXiv:1203.5850},
year = {2012}
}
Comments
Duplicate entry, newer version at 1205.0915. http://arxiv.org/abs/1205.0915