Vertical SNS weak-link Josephson junction fabricated from only boron-doped diamond

M. Watanabe; R. Kanomata; S. Kurihara; A. Kawano; S. Kitagoh; T. Yamaguchi; Y. Takano; H. Kawarada

doi:10.1103/PhysRevB.85.184516

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Vertical SNS weak-link Josephson junction fabricated from only boron-doped diamond

M. Watanabe, R. Kanomata, S. Kurihara, A. Kawano, S. Kitagoh, T. Yamaguchi, Y. Takano, H. Kawarada

DOI 10.1103/PhysRevB.85.184516 · Physical Review B

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Abstract

A vertical superconductor/normal conductor/superconductor (SNS) weak-link Josephson junction has been successfully fabricated from only homoepitaxial diamond films. Superconducting diamond, normal-state diamond, and superconducting diamond are homoepitaxially grown in a sequence. The temperature dependence of the critical superconducting current was fitted using Likharev's theory of SNS weak-link junctions. When the normal-state-diamond thickness L is much larger than the coherent length in the normal-state-diamond ξn, an exponential temperature dependence of normalized critical current was observed, indicating a proximity effect. Shapiro steps in the current-voltage characteristics under microwave irradiation were observed in the junction with L≫ξn.