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Reversible oxygen-driven c(4 x 4) ↔ (1 x 2) phase transition on the Ba/Ge (100) surface (RETRACTED)
Authors: Kuzmin Mikhail, Ebrahimzadeh Masoud, Lehtiö Juha-Pekka, Rad Zahra Jahanshah, Miettinen Mikko, Punkkinen Marko P.J., Laukkanen Pekka, Kokko Kalevi
Publisher: ELSEVIER
Publication year: 2023
Journal: Applied Surface Science
Journal name in source: APPLIED SURFACE SCIENCE
Journal acronym: APPL SURF SCI
Article number: 156992
Volume: 623
Number of pages: 8
ISSN: 0169-4332
eISSN: 1873-5584
DOI: https://doi.org/10.1016/j.apsusc.2023.156992
Web address : https://doi.org/10.1016/j.apsusc.2023.156992
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/179284012
Additional information: RETRACTED: Reversible oxygen-driven c(4×4) ↔ (1×2) phase transition on the Ba/Ge(100) surface. https://doi.org/10.1016/j.apsusc.2023.157326
Modified group-IV(1 00) surfaces have been successfully utilized as a template for growing crystalline oxide films, e.g., BaO. Knowledge of structural and electronic properties of surface reconstructions on group-IV(100) substrates can be used for the control of abruptness and electric properties of oxide/group-IV interfaces. In the present study, reversible Ba/Ge(100) c(4 x 4) ↔ (1 x 2) phase transition, governed by the adsorption of oxygen at room temperature, as well as structural properties of both surface phases have been studied in detail by low -energy electron diffraction, scanning tunneling microscopy, and core-level photoemission using the synchrotron radiation. An atomic model is proposed for the c(4 x 4) reconstruction, and it is shown how this structure is modified upon the interaction with oxygen. Finally, the useful properties of O-containing (1 x 2) reconstruction, which allow one to optimize the growth of crystalline oxide films, are discussed.
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