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

*この研究の対応する著者

研究成果: Article査読

38 被引用数 (Scopus)

抄録

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.

本文言語English
論文番号033301
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
75
3
DOI
出版ステータスPublished - 2007

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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