The role of the dopant in the superconductivity of diamond

Xavier Blase (1) , Christophe Adessi (1) , Damien Connetable (1)

1 LPMCN - Laboratoire de Physique de la Matière Condensée et Nanostructures

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.

Domaines: Supraconductivité [cond-mat.supr-con]

Xavier Blase, Christophe Adessi, Damien Connetable. The role of the dopant in the superconductivity of diamond. 2004. ⟨hal-00002280⟩