Superconducting transition temperature of niobium/graphite bilayers

Toshiharu Kubo, Yoshiko F. Ohashi, Takeshi Kinoshita

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    The superconducting proximity effect in niobium/graphite bilayers was studied. Thin graphite films of various thickness ranging from around 20-160 nm were prepared by cleaving a kish graphite (KG). For making a specimen, niobium (Nb) of 40 nm in thickness was deposited on a KG film and a quartz glass substrate simultaneously using electron-beam evaporation method. Each resistance of Nb and Nb/KG films was measured at the same time, and transition temperature of Nb film (TSC) and Nb/KG film (T* C) on the same substrate was obtained. The ratio of T* C to TSC (T*C/T SC) showed a periodic characteristic with KG film thickness. Furthermore, the peak values of the ratio exceeded 1.00. This result suggests that the electron correlation at Nb/KG interface changes depending on KG film thickness because of the interference of electrons as wave in the KG film.

    Original languageEnglish
    Pages (from-to)58-62
    Number of pages5
    JournalPhysica C: Superconductivity and its applications
    Volume417
    Issue number1-2
    DOIs
    Publication statusPublished - 2004 Dec 15

    Keywords

    • Graphite
    • Niobium
    • Proximity effect
    • Superconductor
    • Transition temperature

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics
    • Energy Engineering and Power Technology
    • Electrical and Electronic Engineering

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