Energy gap and surface structure of superconducting diamond films probed by scanning tunneling microscopy

Terukazu Nishizaki, Yoshihiko Takano, Masanori Nagao, Tomohiro Takenouchi, Hiroshi Kawarada, Norio Kobayashi

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    4 Citations (Scopus)

    Abstract

    We have performed scanning tunneling microscopy/spectroscopy (STM/STS) experiments on (1 1 1)-oriented epitaxial films of heavily boron-doped diamond at T = 0.47 K. The STM topography shows two kinds of atomic structures: a hydrogenated 1 × 1 structure, C(1 1 1)1 × 1:H, and an amorphous structure. On the C(1 1 1)1 × 1:H region, the tunneling spectra show superconducting property with the energy gap Δ = 0.83 meV. The obtained gap ratio 2Δ/kBTc = 3.57 is consistent with the weak-coupling BCS theory.

    Original languageEnglish
    Pages (from-to)210-211
    Number of pages2
    JournalPhysica C: Superconductivity and its Applications
    Volume460-462 I
    Issue numberSPEC. ISS.
    DOIs
    Publication statusPublished - 2007 Sep 1

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    Keywords

    • Boron-doped diamond film
    • Energy gap
    • Scanning tunneling microscopy/spectroscopy

    ASJC Scopus subject areas

    • Condensed Matter Physics

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