A low power 10V programmable array based on NbxSi1-x Josephson junctions for metrology applications

作者：Knipper Richard^*; Anders Solveig; Schubert Marco; Peiselt Katja; Scheller Thomas; Franke Dirk; Dellith Jan; Meyer Hans Georg

来源：Superconductor Science and Technology, 2016, 29(9): 095015.

DOI：10.1088/0953-2048/29/9/095015

• NbxSi1-x
• metrology
• fabrication
• superconductivity

Josephson junctions generate, when subjected to microwave irradiation, voltages with a very high precision and are used in metrology applications. So-called PJVS (programmable Josephson voltage-standards) are capable of generating both AC and DC voltages of up to 10 V. Our work addresses a full fabrication scenario for 10 V PJVS arrays driven at 70 GHz to be used in low microwave-power conditions as in, but not limited to GUNN diodes or cryocooler applications. NbxSi1-x in its function as a barrier material was characterised with AFM, RBS and reflectometry in order to establish a reliable technological foundation. A 10 V PJVS array driven with microwave power below 50 mW is further presented, which was achieved by optimising the fabrication technology regarding the degree of homogeneity of the Josephson junctions composition and thickness. Control over these parameters is crucial in choosing a stable and well-suited characteristic voltage (IcRn product) and criti

• 出版日期2016-9