Physics – Condensed Matter – Superconductivity
Scientific paper
2006-10-05
Phys. Rev. B 75, 033301 (2007)
Physics
Condensed Matter
Superconductivity
4 pages, 6 figures, to be published in Phys. Rev. B (Brief report)
Scientific paper
10.1103/PhysRevB.75.033301
We have investigated the superconductivity discovered in boron (B)-doped diamonds by means of 11B-NMR on heteroepitaxially grown (111) and (100) films. 11B-NMR spectra for all of the films are identified to arise from the substitutional B(1) site as single occupation and lower symmetric B(2) site substituted as boron+hydrogen(B+H) complex, respectively. A clear evidence is presented that the effective carriers introduced by B(1) substitution are responsible for the superconductivity, whereas the charge neutral B(2) sites does not offer the carriers effectively. The result is also corroborated by the density of states deduced by 1/T1T measurement, indicating that the evolution of superconductivity is driven by the effective carrier introduced by substitution at B(1) site.
Harada Atsushi
Kawarada Hiroshi
Kitaoka Yoshio
Mukuda Hidekazu
Nagao Makoto
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