Phonon Softening in Superconducting Diamond
Superconductivity
2007-05-23 v3
Abstract
We observe strong softening of optical phonon modes in superconducting (Tc = 4.2 K) boron doped diamond near the Brillouin zone center using inelastic x-ray scattering from a CVD-grown highly oriented sample. The magnitude of the softening, and our observation that it becomes stronger approaching zone center, supports theoretical models suggesting a phonon-mediated pairing mechanism via coupling of optical phonon modes to Fermi surfaces around the zone center. The electron-phonon coupling parameter is determined as approximately lambda= 0.33.
Cite
@article{arxiv.cond-mat/0512424,
title = {Phonon Softening in Superconducting Diamond},
author = {M. Hoesch and T. Fukuda and T. Takenouchi and J. P. Sutter and S. Tsutsui and A. Q. R. Baron and M. Nagao and Y. Takano and H. Kawarada and J. Mizuki},
journal= {arXiv preprint arXiv:cond-mat/0512424},
year = {2007}
}
Comments
4 pages, 3 figures; Version3: Completely revised, quantitative analysis of lambda; in print at Phys. Rev. B (rapid communication)