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

doi:10.1103/PhysRevB.75.033301

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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

DOI 10.1103/PhysRevB.75.033301 · Physical Review B

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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∕T1T measurement, indicating that the evolution of superconductivity is driven by the effective carrier introduced by substitution at B(1) site.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	unknown