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

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 FeSe 0.5Te 0.5 films. Tc 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.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [2] ;  [2] ;  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States); Kwansei Gakuin Univ. (Japan)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
Publication Date:
Report Number(s):
BNL-113335-2016-JA
Journal ID: ISSN 2041-1723; R&D Project: MA012MABA; MA015MACA; KC0202050; KC0201010
Grant/Contract Number:
SC00112704
Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 7; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Electronic devices; Superconducting properties and materials
OSTI Identifier:
1341612

Ozaki, Toshinori, Li, Qiang, Wu, Lijun, Zhang, Cheng, Jaroszynski, Jan, Si, Weidong, Zhou, Juan, and Zhu, Yimei. A route for a strong increase of critical current in nanostrained iron-based superconductors. United States: N. p., Web. doi:10.1038/ncomms13036.
Ozaki, Toshinori, Li, Qiang, Wu, Lijun, Zhang, Cheng, Jaroszynski, Jan, Si, Weidong, Zhou, Juan, & Zhu, Yimei. A route for a strong increase of critical current in nanostrained iron-based superconductors. United States. doi:10.1038/ncomms13036.
Ozaki, Toshinori, Li, Qiang, Wu, Lijun, Zhang, Cheng, Jaroszynski, Jan, Si, Weidong, Zhou, Juan, and Zhu, Yimei. 2016. "A route for a strong increase of critical current in nanostrained iron-based superconductors". United States. doi:10.1038/ncomms13036. https://www.osti.gov/servlets/purl/1341612.
@article{osti_1341612,
title = {A route for a strong increase of critical current in nanostrained iron-based superconductors},
author = {Ozaki, Toshinori and Li, Qiang and Wu, Lijun and Zhang, Cheng and Jaroszynski, Jan and Si, Weidong and Zhou, Juan and Zhu, Yimei},
abstractNote = {The critical temperature Tc and the critical current density Jc determine the limits to large-scale superconductor applications. Superconductivity emerges at Tc. The practical current-carrying capability, measured by Jc, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce Tc. Simultaneous increase of Tc and Jc in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both Tc and Jc together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. Tc is enhanced due to the nanoscale compressive strain and proximity effect, whereas Jc 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 Jc enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.},
doi = {10.1038/ncomms13036},
journal = {Nature Communications},
number = ,
volume = 7,
place = {United States},
year = {2016},
month = {10}
}