The role of the dopant in the superconductivity of diamond

Details The role of the dopant in the superconductivity of diamond The role of the dopant in the superconductivity of diamond

2004-07-22

arxiv.org/abs/cond-mat/0407604v1

Physics

Condensed Matter

Superconductivity

Scientific paper

10.1103/PhysRevLett.93.237004

We present an {\it 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 $\lambda$ originates in strongly localized defect-related vibrational modes, yielding a very peaked Eliashberg $\alpha^2F(\omega)$ function. The electron-phonon coupling potential is found to be extremely large and T$_C$ is limited by the low value of the density of states at the Fermi level.

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