期刊
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
卷 9, 期 4, 页码 -出版社
NATL INST MATERIALS SCIENCE
DOI: 10.1088/1468-6996/9/4/044210
关键词
boron-doped diamond; superconductivity; Raman spectroscopy; isotope effect
Superconducting boron-doped diamond samples were synthesized with isotopes of B-10, B-11, C-13 and C-12. 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.
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