Experimental investigation of the influence of silver on the properties of bicrystal junction in an HTSC detector
Safonova V. Yu.1,2, Parafin A. E.2, Masterov D. V.2, Pavlov S. A.2, Revin L. S.1,2
1Alekseev State Technical University, Nizhny Novgorod, Russia
2Institute for Physics of Microstructures, Russian Academy of Sciences, Nizhny Novgorod, Russia
Email: rls@ipmras.ru
The study is focused on investigating the silver film influence on bicrystal junction properties in high-temperature superconductor (HTSC) detectors on the basis of YBa2Cu3O7-δ (YBCO). This work analyzed five chips made in different process cycles. Each chip has three types of Josephson detector structures with log-periodic antennas with different configurations. Main focus is made on comparing critical current, normal resistance and typical voltage at 4 K and 77 K. The findings showed that structures with the same Josephson junction dimensions demonstrate considerable difference in parameters. It was found that the deviation of parameters is mainly caused by the proximity of the silver layer to the bicrystal boundary leading to barrier contamination and change of the junction properties. Keywords: YBaCuO, Josephson junction, log-periodic antenna, silver.
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