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Fukuda, Tatsuo; Hoesch, M.*; Takenouchi, Tomohiro*; Sutter, J. P.*; Tsutsui, Satoshi*; Baron, A.*; Nagao, Masanori*; Takano, Yoshihiko*; Kawarada, Hiroshi*; Mizuki, Junichiro
no journal, ,
Diamond is well known for its maximum hardness, large energy gap, high thermal conductivity, and so on. In addition to these, the superconductivity was discovered recently in boron doped (B-doped) diamond, and this was soon confirmed by other groups. We performed inelastic X-ray scattering experiments at BL35XU of SPring-8 to measure phonons in a highly B-doped CVD grown diamond having superconducting transition at 
4.2 K. By comparing the experimental results with those from nitrogen doped CVD grown diamond and/or pure diamond, we found that the optical modes are softened especially at around the Brillouin zone center along with a strong broadening, while the acoustic modes do not show both softening and broadening. This confirms the strong electron-phonon coupling in superconducting diamond.
Onoda, Shinobu; Haruyama, Moriyoshi; Teraji, Tokuyuki*; Isoya, Junichi*; Christoph, M.*; McGuinness, L.*; Balasubramanian, P.*; Naydenov, B.*; Jelezko, F.*; Koike, Godai*; et al.
no journal, ,
no abstracts in English
Kato, Kanami*; Yamano, Hayate*; Kageura, Taisuke*; Seshimo, Yuji*; Inaba, Masafumi*; Higashimata, Itaru*; Koike, Godai*; Tanii, Takashi*; Isoya, Junichi*; Teraji, Tokuyuki*; et al.
no journal, ,
no abstracts in English
Onoda, Shinobu; Haruyama, Moriyoshi; Teraji, Tokuyuki*; Isoya, Junichi*; Koike, Godai*; Higashimata, Itaru*; Inaba, Masafumi*; Yamano, Hayate*; Kato, Kanami*; Christoph, M.*; et al.
no journal, ,
no abstracts in English