Journal
SCIENCE ADVANCES
Volume 5, Issue 4, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.aav5532
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Funding
- Engineering and Physical Sciences Research Council [EP/N509620/1]
- China Scholarship Council
- Cambridge Commonwealth, European and International Trust
- St. John's College
- EPSRC [EP/P026311/1, EP/N017242/1]
- ISF F.I.R.S.T. program [687/16]
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA0003525]
- U.S. NSF [DMR-1565822]
- University of Cambridge
- National Natural Science Foundation of China [21872116]
- Harry de Jur Chair in Applied Science
- EPSRC [EP/N017242/1] Funding Source: UKRI
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A long-term goal for superconductors is to increase the superconducting transition temperature, T-C. In cuprates, T-C depends strongly on the out-of-plane Cu-apical oxygen distance and the in-plane Cu-O distance, but there has been little attention paid to tuning them independently. Here, in simply grown, self-assembled, vertically aligned nanocomposite thin films of La2CuO4+delta + LaCuO3, by strongly increasing out-of-plane distances without reducing in-plane distances (three-dimensional strain engineering), we achieve superconductivity up to 50 K in the vertical interface regions, spaced similar to 50 nm apart. No additional process to supply excess oxygen, e.g., by ozone or high-pressure oxygen annealing, was required, as is normally the case for plain La2CuO4+delta. films. Our proof-of-concept work represents an entirely new approach to increasing T-C in cuprates or other superconductors.
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