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


ABSTRACT: 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.

SUBMITTER: Ozaki T 

PROVIDER: S-EPMC5059717 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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

Ozaki Toshinori T   Wu Lijun L   Zhang Cheng C   Jaroszynski Jan J   Si Weidong W   Zhou Juan J   Zhu Yimei Y   Li Qiang Q  

Nature communications 20161006


The critical temperature T<sub>c</sub> and the critical current density J<sub>c</sub> determine the limits to large-scale superconductor applications. Superconductivity emerges at T<sub>c</sub>. The practical current-carrying capability, measured by J<sub>c</sub>, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce T<sub>c</sub>. Simultaneous increase of T<sub>c</sub> and J<sub>c</sub> in superconductors is desirable but very difficult to realize. Here  ...[more]

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