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Electronic Structure of an Ultrathin Molybdenum Oxide Film

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Abstract

The electronic structure of an ultra-thin molybdenum oxide film obtained by oxidation of molybdenum at an oxygen pressure of 1 Torr and the effect of adsorption of sodium atoms on its electronic structure are studied by photoelectron spectroscopy. Photoemission spectra from the valence band and core levels of O 2s, Mo 3d, Mo 3p, and Na 1p are studied upon synchrotron excitation in the photon energy range 80–600 eV. It is shown that in the formed oxide film, molybdenum is in two states: Mo6+ and Mo4+. On the surface of the oxide, oxygen is induced both in the composition of the oxides and in hydroxyl. It was shown that MoO3 is formed on the surface, and MoO2 at a distance from the surface. The deposition of Na atoms leads to intercalation of the molybdenum oxide layer.

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ACKNOWLEDGMENT

This research project has been supported by the Russian German Laboratory at BESSY II.

We thank HZB for the allocation of synchrotron radiation beam time.

Funding

This work was supported by the Russian Foundation for Basic Research, project no. 20-02-00370.

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Authors and Affiliations

  1. Ioffe Institute, 194021, St. Petersburg, Russia

    P. A. Dementev, E. V. Ivanova & M. N. Lapushkin

  2. Institut für FestKörper und Materialphysik, Technische Universität Dresden, 01062, Dresden, Germany

    D. A. Smirnov

  3. Alferov University, Russian Academy of Sciences, 194021, St. Petersburg, Russia

    S. N. Timoshnev

Authors
  1. P. A. Dementev
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  2. E. V. Ivanova
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  3. M. N. Lapushkin
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  4. D. A. Smirnov
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Correspondence to M. N. Lapushkin.

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Translated by Yu. Ryzhkov

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Dementev, P.A., Ivanova, E.V., Lapushkin, M.N. et al. Electronic Structure of an Ultrathin Molybdenum Oxide Film. Phys. Solid State 62, 1787–1795 (2020). https://doi.org/10.1134/S1063783420100030

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