Novel in-situ fabricated Josephson junctions: trilayer on a substrate slope

We demonstrate a high-temperature superconductor (HTS) Josephson junction geometry using only in situ interfaces and with the current flowing in the a-b plane of the HTS. The trilayer on a substrate slope (TOSS) junction is a HTS-barrier-HTS structure deposited in situ on top of a pre-etched slope in the substrate. We present initial results on the fabrication and testing of YBa₂Cu₃O_7-δ TOSS junctions with a Ga-doped PrBa₂Cu₃O_7-δ barrier. These devices display resistively shunted junction like I-V characteristics with characteristic voltages up to 5 mV at 4.2 K. The TOSS junction concept is of interest for fundamental studies of interfaces in HTS and can also be applied to an integrated circuit technology.