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Electron Spin Resonance of Lithium Related Donor Centers in Bulk Si1−xGex Crystals Enriched in 28Si and 72Ge Isotopes

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Abstract

The lithium donor centers in Si1–xGex (x = 0.0039–0.05) single crystals enriched in spinless 28Si and 72Ge isotopes (99.998 and 99.984%, respectively) are studied by electron spin resonance at temperatures of T = 3.5–30 K and compared with its behavior in Si crystals. It is shown that lithium center with trigonal ([111]) symmetry has a most stable configuration in bulk Si1–xGex for different values of x < 5 at %. Axial symmetry is explained by the distortion of the lithium central position and their neighboring atoms. The spin relaxation rates were studied in temperature range 4–30 K and it was shown that transverse and longitudinal relaxation consist of two components with rates differ by almost an order of magnitude. Together with Raman processes for 1/T1, a decrease in the exponent below T5 is observed. This behavior is explained by cross-relaxation through states of the distorted configuration of lithium, which arise due to modulation of the crystal field potential by random distribution of Ge atoms.

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Funding

This work was supported by Rosatom in the framework of the Roadmap for Quantum computing (Contract No. 868-1.3-15/15-2021 dated October 5, 2021 and Contract No. P2193 г. dated 14.12.2021 21).

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Authors and Affiliations

  1. Lobachevsky State University of Nizhny Novgorod, 23 Pr. Gagarina (Gagarin Avenue), 603950, Nizhny Novgorod, Russia

    E. A. Kalinina, D. V. Guseinov, A. V. Soukhorukov & A. A. Ezhevskii

  2. Kazan (Volga region) Federal University, 18 Kremlevskaya St., 420008, Kazan, Russia

    D. G. Zverev & F. F. Murzakhanov

  3. Leibniz Institute for Crystal Growth, 12489, Berlin, Germany

    N. V. Abrosimov

Authors
  1. E. A. Kalinina
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  2. D. V. Guseinov
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  3. A. V. Soukhorukov
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  4. A. A. Ezhevskii
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  5. D. G. Zverev
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  6. F. F. Murzakhanov
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  7. N. V. Abrosimov
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Contributions

AAE and EAK: wrote the main text. DVG and AVS: carried out cw- ESR measuremnts and prepared Figs. 1, 2, 3, 6, 7, 8 and 9. DGZ and FFM: carried out pulsed -ESR measurements and prepared Figs. 4, 5. NVA: grew single crystals of 28Si1−x 72Gex. All authors reviewed the manuscript.

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Correspondence to D. V. Guseinov.

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Kalinina, E.A., Guseinov, D.V., Soukhorukov, A.V. et al. Electron Spin Resonance of Lithium Related Donor Centers in Bulk Si1−xGex Crystals Enriched in 28Si and 72Ge Isotopes. Appl Magn Reson (2024). https://doi.org/10.1007/s00723-023-01640-w

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  • DOI: https://doi.org/10.1007/s00723-023-01640-w

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