Abstract
We have fabricated Y 1Ba 2Cu 3O 7−δ (YBCO) superconducting weak links by depositing a perpendicular stripe of YBCO film on top of a 0.25μm–1.5μm wide line of normal metal (e.g. Ag) previously deposited onto a SrTiO 3 substrate. The c-axis orientation of the YBCO film is interrupted over the metal line, creating a disordered grain boundary junction. Measurements of the resistive transition, critical current and current-voltage (IV) characteristics of these structures show definite weak link behavior: the critical current is significantly reduced from that of samples with no metal line present and the IV curves show qualitative agreement with the Ambegaokar-Halperin (AH) model of Josephson weak links with thermal noise.
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