Phonon Softening in Superconducting Diamond

Details Phonon Softening in Superconducting Diamond Phonon Softening in Superconducting Diamond

2005-12-18

arxiv.org/abs/cond-mat/0512424v3

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures; Version3: Completely revised, quantitative analysis of lambda; in print at Phys. Rev. B (rapid communicati

Scientific paper

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.

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