Structure and superconductivity of isotope-enriched boron-doped diamond

Journal Article · Tue Jan 01 04:00:00 EST 2008 · Science and Technology of Advanced Materials

OSTI ID:960980

Thompson, Joe D ^[1]; Ekimov, E A ^[2]; Sidorov, V A ^[2]; Zoteev, A ^[3]; Lebed, Y ^[4]; Stishov, S M ^[5]

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1. Los Alamos National Laboratory
2. INSTIT OF HIGH PRESSURE
3. MOSCOW SU
4. INST FOR NUCI RES
5. INST FOR HIGH PRESSURE

Superconducting boron-doped diamond samples were synthesized with isotopes of {sup 10}B, {sup 11}B, {sup 13}C and {sup 12}C. 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{sup 01} 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.

• Research Organization: Los Alamos National Laboratory (LANL)
• Sponsoring Organization: DOE
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 960980
• Report Number(s): LA-UR-08-06866; LA-UR-08-6866
• Journal Information: Science and Technology of Advanced Materials, Journal Name: Science and Technology of Advanced Materials; ISSN 1468-6996
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ATOMS
BORON
BORON 10
BORON 11
BORON ISOTOPES
CARBON
CARBON 12
CARBON 13
CARBON ISOTOPES
CHEMICAL COMPOSITION
CRYSTAL STRUCTURE
DIAMONDS
DOPED MATERIALS
ELECTRON-PHONON COUPLING
INTERACTIONS
ISOTOPES
LATTICE PARAMETERS
RAMAN SPECTRA
SUPERCONDUCTIVITY
SYNTHESIS
TRANSITION TEMPERATURE