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

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Abstract

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.

Original languageEnglish
Article number033301
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume75
Issue number3
DOIs
Publication statusPublished - 2007 Jan 25

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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