Hydrogen-impurity-induced conductance peaks in constriction type Josephson junctions

We studied hydrogen (H) and deuterium (D) impurity effects of superconducting Josephson current flowing through the superconductor-constriction-superconductor Josephson junctions (ScS-JJ). When H or D impurities are adsorbed on the surface of the ScS-JJ prepared by niobium or lead, many spike-like p...

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Bibliographic Details
Published in:Applied physics express 2022-01, Vol.15 (1), p.13002
Main Authors: Miyakawa, Kazuki, Takata, Hiroki, Yamaguchi, Taishi, Inagaki, Yuji, Makise, Kazumasa, Kawae, Tatsuya
Format: Article
Language:English
Subjects:
hydrogen impurity
Josephson current
noise
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Summary:We studied hydrogen (H) and deuterium (D) impurity effects of superconducting Josephson current flowing through the superconductor-constriction-superconductor Josephson junctions (ScS-JJ). When H or D impurities are adsorbed on the surface of the ScS-JJ prepared by niobium or lead, many spike-like peaks with almost the same spacing appear inside the superconducting gap in addition to anomalies owing to the multiple Andreev reflection in the differential conductance spectra. The spacing between the adjacent peaks is independent of the temperature variation. These indicate that H or D impurities adsorbed on the JJ are sources of noise for the Josephson current.
ISSN:1882-0778
1882-0786
DOI:10.35848/1882-0786/ac42ff