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American Physical Society, Physical review B, 14(75)

DOI: 10.1103/physrevb.75.140508

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Phonon Softening in Superconducting Diamond

Journal article published in 2006 by M. Hoesch ORCID, T. Fukuda, J. Mizuki, T. Takenouchi, J. P. Sutter, H. Kawarada, S. Tsutsui, A. Q. R. Baron ORCID, M. Nagao, Y. Takano
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This paper is available in a repository.

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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.