Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films

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

    Research output: Contribution to journalArticle

    13 Citations (Scopus)

    Abstract

    We report on scanning tunneling microscopy/spectroscopy (STM/STS) experiments on (1 1 1)-oriented epitaxial films of heavily boron-doped diamond grown by using the microwave plasma-assisted chemical vapor deposition method. STM/STS measurements were performed by 3He-refrigerator based STM under ultra-high vacuum. The STM topography on the film surface shows a corrugation (with a typical size of ∼1 μm) and grain-like microstructures (∼5-20 nm). The tunneling conductance spectra do not show large spatial dependence and superconductivity is observed independent of the surface structures. The tunneling spectra are analyzed by the Dynes function and the superconducting energy gap is estimated to be Δ = 0.87 meV at T=0.47 K, corresponding to 2 Δ / kB Tc = 3.7. The relatively large value of the broadening parameter Γ = 0.38 meV is discussed in terms of the inelastic electron scattering processes.

    Original languageEnglish
    Pages (from-to)22-26
    Number of pages5
    JournalScience and Technology of Advanced Materials
    Volume7
    Issue numberSUPPL. 1
    DOIs
    Publication statusPublished - 2006

    Fingerprint

    Boron
    Diamond films
    Scanning tunneling microscopy
    Spectroscopy
    Inelastic scattering
    Diamond
    Electron scattering
    Refrigerators
    Epitaxial films
    Ultrahigh vacuum
    Superconductivity
    Surface structure
    Topography
    Chemical vapor deposition
    Diamonds
    Energy gap
    Microwaves
    Plasmas
    Microstructure
    Experiments

    Keywords

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

    ASJC Scopus subject areas

    • Materials Science(all)

    Cite this

    Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films. / Nishizaki, Terukazu; Takano, Yoshihiko; Nagao, Masanori; Takenouchi, Tomohiro; Kawarada, Hiroshi; Kobayashi, Norio.

    In: Science and Technology of Advanced Materials, Vol. 7, No. SUPPL. 1, 2006, p. 22-26.

    Research output: Contribution to journalArticle

    Nishizaki, Terukazu ; Takano, Yoshihiko ; Nagao, Masanori ; Takenouchi, Tomohiro ; Kawarada, Hiroshi ; Kobayashi, Norio. / Scanning tunneling microscopy and spectroscopy studies of superconducting boron-doped diamond films. In: Science and Technology of Advanced Materials. 2006 ; Vol. 7, No. SUPPL. 1. pp. 22-26.
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    AU - Kawarada, Hiroshi

    AU - Kobayashi, Norio

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