Abstract:
:Although giant proximity effect (GPE) can shed important information on understanding superconducting pairing mechanisms and superconducting electronics, reports on the GPE are few because the fabrication of the junctions with GPE is technologically difficult. Here, we report a GPE in the single-crystalline MgB2 bilayers (S'/S), where the S' is the damaged MgB2 layer by cobalt (Co)-ion irradiation and the S is the undamaged MgB2 layer. Superconducting properties of the S' is remarkably degraded by the irradiation, whereas those of the S is uninfluenced by the irradiation. The degraded superconductivity in the S' is fully recovered by increasing the thickness of undamaged MgB2 layer S despite almost ten times larger thickness ~ 95 nm of S' than the superconducting coherence length ξab(0) ~ 8.5 nm of the S, indicating a presence of GPE in the S'/S MgB2 bilayers. A diffusion of electrons in the S' into the S can reduce a pair breaking scattering in the S', and the similar electronic structures of S' and S layers and a finite attractive electron-electron interaction in the S' are thought to be origins of unpredicted GPE between the same superconducting materials. Both upper critical field (μ0Hc2) and in-field critical current density (Jc) of S'/S bilayers show a significant enhancement, representing a strong correlation between S' and S. These discoveries provide the blue print to the design of the superconducting multilayers for fundamental researches on the mechanism of the GPE as well as their technological applications.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Jung SG,Pham D,Park TH,Choi HY,Seo JW,Kang WN,Park Tdoi
10.1038/s41598-019-40263-9subject
Has Abstractpub_date
2019-03-01 00:00:00pages
3315issue
1issn
2045-2322pii
10.1038/s41598-019-40263-9journal_volume
9pub_type
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