Phonon softening in superconducting diamond
M. Hoesch, T. Fukuda, J. Mizuki, T. Takenouchi, H. Kawarada, J. P. Sutter, S. Tsutsui, A. Q. R. Baron, M. Nagao, Y. Takano
DOI 10.1103/PhysRevB.75.140508 · Physical Review B
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Abstract
We observe strong softening of optical-phonon modes in superconducting (Tc=4.2K) boron-doped diamond near the Brillouin-zone center using inelastic x-ray scattering from a chemical vapor deposition 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 λ=0.33.
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