Ekimov EA, Sidorov VA, Zoteev AV, Lebed JB, Thompson JD, Stishov SM. Structure and superconductivity of isotope-enriched boron-doped diamond.
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2008;
9:044210. [PMID:
27878027 PMCID:
PMC5099641 DOI:
10.1088/1468-6996/9/4/044210]
[Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2008] [Revised: 01/28/2009] [Accepted: 12/10/2008] [Indexed: 05/31/2023]
Abstract
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. The absence of a superconducting transition (down to 1.6 K) in diamonds synthesized in the Co-C-B system at 1900 K correlates with the small boron concentration deduced from lattice parameters.
Collapse