Europium oxide : Growth guide for the first monolayers on oxidic substrates

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Physical Review Materials. American Physical Society. 2022, 6(4), 044404. eISSN 2475-9953. Available under: doi: 10.1103/PhysRevMaterials.6.044404
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Interfacial oxygen exchange at oxide interfaces bears huge potential in stabilizing metastable or novel phases of functional oxides down to the monolayer limit. By taking advantage of active oxygen supply of the substrate material, waiving any external oxygen dosage, high-quality, crystalline ultrathin films of the Heisenberg ferromagnet europium monoxide (EuO) were stabilized on YSZ (001). This so-called redox-assisted growth mode (or, vice versa, the extreme case of a distillation growth) was monitored end to end by in situ x-ray photoelectron emission spectroscopy and electron diffraction techniques. The evolution of Eu 3d core levels allows us to disentangle the processes of interfacial oxygen diffusion and vacancy formation in stabilizing the very first monolayers of EuO on YSZ (001). An expedient background correction analysis is presented, which allows us to quantify the critical Eu3+/Eu2+ ratio in the ultrathin film regime. We concluded on the key mechanisms of redox-assisted EuO/YSZ (001) thin film synthesis, which merge in a universal three-process growth model that may serve as guideline for redox-assisted synthesis of metastable low-dimensional oxides.

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ISO 690ROSENBERGER, Paul, Martina MÜLLER, 2022. Europium oxide : Growth guide for the first monolayers on oxidic substrates. In: Physical Review Materials. American Physical Society. 2022, 6(4), 044404. eISSN 2475-9953. Available under: doi: 10.1103/PhysRevMaterials.6.044404
BibTex
@article{Rosenberger2022Europ-57569,
  year={2022},
  doi={10.1103/PhysRevMaterials.6.044404},
  title={Europium oxide : Growth guide for the first monolayers on oxidic substrates},
  number={4},
  volume={6},
  journal={Physical Review Materials},
  author={Rosenberger, Paul and Müller, Martina},
  note={Article Number: 044404}
}
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    <dcterms:abstract xml:lang="eng">Interfacial oxygen exchange at oxide interfaces bears huge potential in stabilizing metastable or novel phases of functional oxides down to the monolayer limit. By taking advantage of active oxygen supply of the substrate material, waiving any external oxygen dosage, high-quality, crystalline ultrathin films of the Heisenberg ferromagnet europium monoxide (EuO) were stabilized on YSZ (001). This so-called redox-assisted growth mode (or, vice versa, the extreme case of a distillation growth) was monitored end to end by in situ x-ray photoelectron emission spectroscopy and electron diffraction techniques. The evolution of Eu 3d core levels allows us to disentangle the processes of interfacial oxygen diffusion and vacancy formation in stabilizing the very first monolayers of EuO on YSZ (001). An expedient background correction analysis is presented, which allows us to quantify the critical Eu&lt;sup&gt;3+&lt;/sup&gt;/Eu&lt;sup&gt;2+&lt;/sup&gt; ratio in the ultrathin film regime. We concluded on the key mechanisms of redox-assisted EuO/YSZ (001) thin film synthesis, which merge in a universal three-process growth model that may serve as guideline for redox-assisted synthesis of metastable low-dimensional oxides.</dcterms:abstract>
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