TY - JOUR
T1 - Vertical SNS weak-link Josephson junction fabricated from only boron-doped diamond
AU - Watanabe, M.
AU - Kanomata, R.
AU - Kurihara, S.
AU - Kawano, A.
AU - Kitagoh, S.
AU - Yamaguchi, T.
AU - Takano, Y.
AU - Kawarada, H.
PY - 2012/5/14
Y1 - 2012/5/14
N2 - 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 ξ n, 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 ξ n.
AB - 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 ξ n, 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 ξ n.
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U2 - 10.1103/PhysRevB.85.184516
DO - 10.1103/PhysRevB.85.184516
M3 - Article
AN - SCOPUS:84861672374
SN - 1098-0121
VL - 85
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 18
M1 - 184516
ER -