Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates

Bruns D, Kiesel I, Jentsch S, Lindemann S, Otte C, Schemme T, Kuschel T, Wollschläger J (2014)
Journal of Physics: Condensed Matter 26(31): 315001.

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Abstract
Iron oxide monolayers are grown on Ag(001) via reactive molecular beam epitaxy (metal deposition in oxygen atmosphere). The monolayer shows FeO stoichiometry as concluded from x-ray photoemission spectra. Both low energy electron diffraction as well as scanning tunneling microscopy demonstrate that the FeO layer has a quasi-hexagonal (111) structure although deposited on a surface with square symmetry. Compared to bulk values, the FeO(111) monolayer is unidirectionally expanded by 3.4% in <11-2> directions while bulk values are maintained in <1-10> directions. In <11-2> directions, this lattice mismatch between FeO(111) monolayer and Ag(001) causes a commensurate undulation of the FeO monolayer where 18 atomic rows of the FeO(111) monolayer match 17 atomic rows of the Ag(001) substrate. In <1-10> directions, however, the FeO(111) monolayer has an incommensurate structure.
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Bruns D, Kiesel I, Jentsch S, et al. Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates. Journal of Physics: Condensed Matter. 2014;26(31): 315001.
Bruns, D., Kiesel, I., Jentsch, S., Lindemann, S., Otte, C., Schemme, T., Kuschel, T., et al. (2014). Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates. Journal of Physics: Condensed Matter, 26(31): 315001.
Bruns, D., Kiesel, I., Jentsch, S., Lindemann, S., Otte, C., Schemme, T., Kuschel, T., and Wollschläger, J. (2014). Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates. Journal of Physics: Condensed Matter 26:315001.
Bruns, D., et al., 2014. Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates. Journal of Physics: Condensed Matter, 26(31): 315001.
D. Bruns, et al., “Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates”, Journal of Physics: Condensed Matter, vol. 26, 2014, : 315001.
Bruns, D., Kiesel, I., Jentsch, S., Lindemann, S., Otte, C., Schemme, T., Kuschel, T., Wollschläger, J.: Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates. Journal of Physics: Condensed Matter. 26, : 315001 (2014).
Bruns, Daniel, Kiesel, Irena, Jentsch, Steffen, Lindemann, Sören, Otte, Christian, Schemme, Tobias, Kuschel, Timo, and Wollschläger, Joachim. “Structural analysis of FeO(111)/Ag(001): undulation of hexagonal oxide monolayers due to square lattice metal substrates”. Journal of Physics: Condensed Matter 26.31 (2014): 315001.
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