Superconducting transition temperature of niobium/graphite bilayers

Toshiharu Kubo, Yoshiko F. Ohashi, Takeshi Kinoshita

Research output: Contribution to journalArticlepeer-review

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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