Electron-Phonon Coupling in Boron-Doped Diamond Superconductor
Abstract
The electronic structure, lattice dynamics, and electron-phonon coupling of the boron-doped diamond are investigated using the density functional supercell method. Our results indicate the boron-doped diamond is a phonon mediated superconductor, con rming previous theoretical conclusions deduced from the calculations employing the virtual crystal approximation. We show that the optical phonon modes involving B vibrations play an important role in the electron-phonon coupling. Di erent from previous theoretical results, our calculated electron-phonon coupling constant is 0.39 and the estimated superconducting transition temperature Tc is 4.4 K for the boron doped diamond with 2.78% boron content using the Coulomb pseudopotential \mu*= 0.10, in excellent agreement with the experimental result.
Cite
@article{arxiv.cond-mat/0406446,
title = {Electron-Phonon Coupling in Boron-Doped Diamond Superconductor},
author = {H. J. Xiang and Zhenyu Li and Jinlong Yang and J. G. Hou and Qingshi Zhu},
journal= {arXiv preprint arXiv:cond-mat/0406446},
year = {2007}
}
Comments
11 pages, 4 figures, Accepted by PRB