Microscopic evidence for evolution of superconductivity by effective carrier doping in boron-doped diamond: B11 -NMR study

H. Mukuda, T. Tsuchida, A. Harada, Y. Kitaoka, T. Takenouchi, Y. Takano, M. Nagao, I. Sakaguchi, T. Oguchi, H. Kawarada

研究成果: Article

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We have investigated the superconductivity discovered in boron-doped diamonds by means of B11 -NMR on heteroepitaxially grown (111) and (100) films. B11 -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. 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 T1 T measurement, indicating that the evolution of superconductivity is driven by the effective carrier introduced by substitution at B(1) site.

元の言語English
記事番号033301
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
75
発行部数3
DOI
出版物ステータスPublished - 2007 1 25

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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