Superconductivity in diamond

  • Sidorov V
  • Ekimov E
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We survey methods of synthesis of boron doped diamond with high pressure-high temperature techniques. New route is proposed for synthesis of relatively large heavily boron doped diamond single crystals, which exhibit superconductivity. Superconducting boron-doped diamond samples were synthesized with isotopes of 10B, 11B, 13C and 12C. We claim the presence of a carbon isotope effect on the superconducting transition temperature, which supports the "diamond-carbon"-related nature of superconductivity and the importance of the electron-phonon interaction as the mechanism of superconductivity in diamond. Isotope substitution permits us to relate almost all bands in the Raman spectra of heavily boron-doped diamond to the vibrations of carbon atoms. The 500 cm- 1 Raman band shifts with either carbon or boron isotope substitution and may be associated with vibrations of paired or clustered boron. © 2009 Elsevier B.V. All rights reserved.

Author-supplied keywords

  • Boron-doped diamond
  • Isotope effect
  • Raman spectroscopy
  • Single crystal
  • Superconductivity

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  • V. A. Sidorov

  • E. A. Ekimov

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