Author:
Miyakawa Kazuki,Takata Hiroki,Yamaguchi Taishi,Inagaki Yuji,Makise Kazumasa,Kawae Tatsuya
Abstract
Abstract
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.
Funder
Japan Society for the Promotion of Science
Iketani Science and Technology Foundation
Nippon Sheet Glass Foundation for Materials Science and Engineering
Subject
General Physics and Astronomy,General Engineering
Cited by
3 articles.
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