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Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 44: Poster: Oxide and Insulator surfaces: Structure, Epitaxy, Growth and Adsorption

O 44.6: Poster

Tuesday, March 13, 2018, 18:15–20:30, Poster A

Surface terminations of oxidized Nb(110), from Nb2O5 to NbO1 ≈ x — •Kuanysh Zhussupbekov1, Brian Walls1, Killian Walshe1, Emma Norton1, Sergey I. Bozhko2, Karsten Fleischer1, Andrey M. Ionov2, Valery N. Semenov2, and Igor V. Shvets11School of Physics and Centre for Research on Adaptive Nanostructures and Nanodevices (CRANN), Trinity College, University of Dublin, Dublin 2, Ireland — 2Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka, Russia

The oxidation of single crystalline Nb(110) is investigated by low-energy electron diffraction (LEED), X-ray photoelectron spectroscopy (XPS), scanning tunneling microscopy (STM) and spectroscopy (STS). Oxidizing at low temperature and/or high oxygen partial pressure results in the formation of Nb2O5. STM measurements reveal an amorphous surface which is found to be insulating by STS measurements. Annealing in ultra-high vacuum (UHV) above 700oC removes this native oxide and sees the formation of NbOx ≈ 1 surface [1]. This surface is characterized by stick-shaped NbOx ≈ 1 nanocrystals. The terrace step width is defined by the nanocrystal stick length and one-dimensional terrace states are observed by STS measurements. Ion bombardment of this surface and subsequent annealing forms a NbOx ≈ 1 surface with a different terrace structure. Finally, the oxidation of the NbOx ≈ 1 nanocrystal surface is investigated; room temperature oxidization and subsequent UHV annealing results the extra oxygen sitting in between the NbOx ≈ 1 nanocrystals.

[1]. I. Arfaoui et al., Physical Review B 65, 115413 (2002).

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