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XAFS Spectroscopy Study of Microstructure and Electronic Structure of Heterosystems Containing Si/GeMn Quantum Dots

  • ELECTRONIC PROPERTIES OF SOLID
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Abstract

Using X-ray absorption near edge structure spectroscopy, extended X-ray absorption fine structure spectroscopy, atomic force microscopy, and Rutherford backscattering spectroscopy, the features of the microstructure and elemental composition of Si/GeMn magnetic systems obtained by molecular beam epitaxy and containing quantum dots are studied. Intense mixing of Ge and Si atoms is found in all samples. The degree of mixing (diffusion) correlates with the conditions of synthesis of Si/GeMn samples. For these systems, direct contacts of germanium atoms with manganese atoms are characterized and the presence of interstitial manganese with tetrahedral coordination and substitution of manganese for germanium and silicon in the lattice sites is found. The presence of stoichiometric phases Ge8Mn11, Ge3Mn5 is not detected. The correlations of the Ge, Si, and Mn coordination numbers in the Ge environment are determined both with the Mn flux value (evaporator temperature) and with the temperature at which quantum dots are grown, as well as with other synthesis conditions. The manganese concentration in the samples is determined.

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ACKNOWLEDGMENTS

This work was supported in part by the Russian Foundation for Basic Research (grant nos. 16-02-00175_a (XAFS spectroscopy study), 16-02-00397_a (Synthesis of structures)).

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Authors and Affiliations

  1. Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    S. B. Erenburg, S. V. Trubina & V. A. Zvereva

  2. Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    S. B. Erenburg

  3. Rzhanov Institute of Semiconductor Physics, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    V. A. Zinoviev, A. V. Katsyuba & A. V. Dvurechenskii

  4. Rossendorf Beamline at the ESRF, 38043, Grenoble, France

    K. Kvashnina

  5. Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, 01328, Dresden, Germany

    K. Kvashnina

  6. Helmholtz-Zentrum Dresden-Rossendorf (HZDR), Institute of Ion Beam Physics and Materials Research, 01328, Dresden, Germany

    M. Voelskow

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  1. S. B. Erenburg
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  2. S. V. Trubina
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  4. V. A. Zinoviev
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  5. A. V. Katsyuba
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  8. M. Voelskow
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Correspondence to S. B. Erenburg.

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Translated by A. Zeigarnik

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Erenburg, S.B., Trubina, S.V., Zvereva, V.A. et al. XAFS Spectroscopy Study of Microstructure and Electronic Structure of Heterosystems Containing Si/GeMn Quantum Dots. J. Exp. Theor. Phys. 128, 303–311 (2019). https://doi.org/10.1134/S1063776119020067

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  • DOI: https://doi.org/10.1134/S1063776119020067

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