The role of the dopant in the superconductivity of diamond
Abstract
We present an ab initio study of the recently discovered superconductivity of boron doped diamond within the framework of a phonon-mediated pairing mechanism. The role of the dopant, in substitutional position, is unconventional in that half of the coupling parameter λ originates in strongly localized defect-related vibrational modes, yielding a very peaked Eliashberg α2F(ω) function. The electron-phonon coupling potential is found to be extremely large and TC is limited by the low value of the density of states at the Fermi level.
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