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Phonon Softening in Superconducting Diamond

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arxiv cond-mat/0512424 v3 pith:HDCJSUXX submitted 2005-12-18 cond-mat.supr-con

M. Hoesch , T. Fukuda , T. Takenouchi , J.P. Sutter , S. Tsutsui , A.Q.R. Baron , M. Nagao , Y. Takano
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H. Kawarada J. Mizuki
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classification cond-mat.supr-con
keywords centerphononsofteningzonecouplingdiamondmodesoptical
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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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