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Here, we report a GPE in the single-crystalline MgB<jats:sub>2<\/jats:sub>bilayers (<jats:italic>S<\/jats:italic>\u2032\/<jats:italic>S<\/jats:italic>), where the<jats:italic>S<\/jats:italic>\u2032 is the damaged MgB<jats:sub>2<\/jats:sub>layer by cobalt (Co)-ion irradiation and the<jats:italic>S<\/jats:italic>is the undamaged MgB<jats:sub>2<\/jats:sub>layer. Superconducting properties of the<jats:italic>S<\/jats:italic>\u2032 is remarkably degraded by the irradiation, whereas those of the<jats:italic>S<\/jats:italic>is uninfluenced by the irradiation. The degraded superconductivity in the<jats:italic>S<\/jats:italic>\u2032 is fully recovered by increasing the thickness of undamaged MgB<jats:sub>2<\/jats:sub>layer<jats:italic>S<\/jats:italic>despite almost ten times larger thickness ~ 95\u2009nm of<jats:italic>S<\/jats:italic>\u2032 than the superconducting coherence length<jats:italic>\u03be<\/jats:italic><jats:sub>ab<\/jats:sub>(0) ~ 8.5\u2009nm of the<jats:italic>S<\/jats:italic>, indicating a presence of GPE in the<jats:italic>S<\/jats:italic>\u2032<jats:italic>\/S<\/jats:italic>MgB<jats:sub>2<\/jats:sub>bilayers. A diffusion of electrons in the<jats:italic>S<\/jats:italic>\u2032 into the<jats:italic>S<\/jats:italic>can reduce a pair breaking scattering in the<jats:italic>S<\/jats:italic>\u2032, and the similar electronic structures of<jats:italic>S<\/jats:italic>\u2032 and<jats:italic>S<\/jats:italic>layers and a finite attractive electron-electron interaction in the<jats:italic>S<\/jats:italic>\u2032 are thought to be origins of unpredicted GPE between the same superconducting materials. Both upper critical field (<jats:italic>\u03bc<\/jats:italic><jats:sub>0<\/jats:sub><jats:italic>H<\/jats:italic><jats:sub>c2<\/jats:sub>) and in-field critical current density (<jats:italic>J<\/jats:italic><jats:sub>c<\/jats:sub>) of<jats:italic>S<\/jats:italic>\u2032\/<jats:italic>S<\/jats:italic>bilayers show a significant enhancement, representing a strong correlation between<jats:italic>S<\/jats:italic>\u2032 and<jats:italic>S<\/jats:italic>. 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.<\/jats:p>","DOI":"10.1038\/s41598-019-40263-9","type":"journal-article","created":{"date-parts":[[2019,3,1]],"date-time":"2019-03-01T11:06:43Z","timestamp":1551438403000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Giant proximity effect in single-crystalline MgB2 bilayers"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6517-0543","authenticated-orcid":false,"given":"Soon-Gil","family":"Jung","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Duong","family":"Pham","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tae-Ho","family":"Park","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Han-Yong","family":"Choi","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jin Won","family":"Seo","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Won Nam","family":"Kang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tuson","family":"Park","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,3,1]]},"reference":[{"key":"40263_CR1","doi-asserted-by":"publisher","first-page":"672","DOI":"10.1103\/PhysRev.117.672","volume":"117","author":"H Meissner","year":"1960","unstructured":"Meissner, H. 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