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

Ozaki, Toshinori; Li, Qiang; Wu, Lijun; Zhang, Cheng; Jaroszynski, Jan; Si, Weidong; Zhou, Juan; Zhu, Yimei

doi:10.1038/ncomms13036

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

Journal Article · Thu Oct 06 00:00:00 EDT 2016 · Nature Communications

DOI:https://doi.org/10.1038/ncomms13036· OSTI ID:1341612

Ozaki, Toshinori ^[1]; Li, Qiang ^[2]; Wu, Lijun ^[2]; Zhang, Cheng ^[2]; Jaroszynski, Jan ^[3]; Si, Weidong ^[2]; Zhou, Juan ^[2]; Zhu, Yimei ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States); Kwansei Gakuin Univ. (Japan)
Brookhaven National Lab. (BNL), Upton, NY (United States)
Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)

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.

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Research Organization:: Brookhaven National Laboratory (BNL), Upton, NY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC00112704

OSTI ID:: 1341612

Report Number(s):: BNL-113335-2016-JA; R&D Project: MA012MABA; MA015MACA; KC0202050; KC0201010

Journal Information:: Nature Communications, Vol. 7; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 55 works

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