Abstract
High- T c weak links consisting of two superconducting thin film YBCO electrodes coupled by a short (∼ 300 nm) bridge modified by oxygen-ion irradiation of the same YBCO film are investigated in this work. To fabricate these devices we have developed a technology, which is compatible with conventional integrated circuit fabrication techniques and enables controllable and reproducible preparation of the weak links and SQUID's operating at liquid-nitrogen temperature. We describe in detail the electrical behavior of the bridges, which show RSJ-like (resistively shunted junction model) properties for a small critical current (∼ 10 μA), with resistances of up to 1 Ω. The transport mechanism providing the Josephson coupling across such barriers is still not unambiguously identified. We believe that our devices are SNS type in the operation range of the SQUIDs and SS'S at lower temperatures.
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