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A route for a strong increase of critical current in nanostrained iron-based superconductors

Title: A route for a strong increase of critical current in nanostrained iron-based superconductors.
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Name(s): Ozaki, Toshinori, author
Wu, Lijun, author
Zhang, Cheng, author
Jaroszynski, Jan, author
Si, Weidong, author
Zhou, Juan, author
Zhu, Yimei, author
Li, Qiang, author
Type of Resource: text
Genre: Text
Date Issued: 2016-10-06
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The critical temperature T-c and the critical current density J(c) determine the limits to large-scale superconductor applications. Superconductivity emerges at T-c. The practical current-carrying capability, measured by J(c), is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce T-c. Simultaneous increase of T-c and J(c) in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both T-c and J(c) together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. T-c is enhanced due to the nanoscale compressive strain and proximity effect, whereas J(c) is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of J(c) enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.
Identifier: FSU_libsubv1_wos_000385556300001 (IID), 10.1038/ncomms13036 (DOI)
Keywords: ba(fe1-xcox)(2)as-2 thin-films, critical-current-density, critical-temperature, electron-microscopy, final optimization strain, irradiation defects, nb-ti superconductor, phase-diagram, pinning mechanism, quantitative description
Publication Note: The publisher’s version of record is available at http://www.dx.doi.org/10.1038/ncomms13036
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000385556300001
Host Institution: FSU
Is Part Of: Nature Communications.
2041-1723
Issue: vol. 7

Choose the citation style.
Ozaki, T., Wu, L., Zhang, C., Jaroszynski, J., Si, W., Zhou, J., … Li, Q. (2016). A route for a strong increase of critical current in nanostrained iron-based superconductors. Nature Communications. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000385556300001