Microscopic Evidence for Evolution of Superconductivity by Effective Carrier Doping in Boron-doped Diamond:11B-NMR study

Abstract

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.

4 pages, 6 figures, to be published in Phys. Rev. B (Brief report)

References in corpus (6)

• Superconductivity in diamond
• Superconductivity in CVD Diamond Thin Film Well-Above Liquid Helium Temperature
• Three-dimensional MgB${}_2$-type superconductivity in hole-doped diamond
• Origin of Superconductivity in Boron-doped Diamond
• Dependence of the superconducting transition temperature on the doping level in single crystalline diamond films
• The role of the dopant in the superconductivity of diamond

Cited by in corpus (6)

• Localization and Superconductivity in Doped Semiconductors
• Effects of Rashba-spin-orbit coupling on superconducting boron-doped nanocrystalline diamond films: evidence of interfacial triplet superconductivity
• Model for the boron-doping dependence of the critical temperature of superconducting boron-doped diamond
• Effect of boron dimers on the superconducting critical temperature in boron-doped diamond
• Superconductivity in heavily vacant diamond
• Substitutional doping of Cu in diamond: Mott physics with $p$ orbitals