2005/12/18 by Moritz Hoesch, Hoesch, M., Takashi Fukuda +17
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Diamond and Carbon-based Materials Research #FOS: Physical sciences #High-pressure geophysics and materials #Superconductivity (cond-mat.supr-con)
paper · pdf · doi:10.48550/arxiv.cond-mat/0512424
openalex publication_date 2005/12/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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.