Abstract
We report an 11B NMR study of heavily boron-doped diamond. By comparing 11B spectra withthose from 13C, we find that substitutional boron dopants are limited to 0.26 at.% in an isolated form.This observation reveals that, above the metal–insulator transition, boron dopants areincorporated into carbon sites mostly in the form of boron aggregates and suggests that, inaddition to the holes in the valence band, an impurity band formed by boron aggregatesplays an important role in the superconductivity in the heavily B-doped regime. A strongdisorder effect deduced from Knight shift and nuclear spin–lattice relaxation ratemeasurements is attributed to the overlap between the intrinsic valence band and a boronimpurity band.
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