Enhanced critical current in superconducting FeSe0.5 Te 0.5 films at all magnetic field orientations by scalable gold ion irradiation

Ozaki, Toshinori; Wu, Lijun; Zhang, Cheng; Si, Weidong; Jie, Qing; Li, Qiang

doi:10.1088/1361-6668/aaa3c4

Title: Enhanced critical current in superconducting FeSe_0.5 Te _0.5 films at all magnetic field orientations by scalable gold ion irradiation

Journal Article · 17 January 2018 · Superconductor Science and Technology

DOI: https://doi.org/10.1088/1361-6668/aaa3c4 · OSTI ID:1426458

^[1]; Wu, Lijun ^[2];

^[2]; Si, Weidong ^[2]; Jie, Qing ^[2]; Li, Qiang ^[2]

Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Kwansei Gakuin Univ., Hyogo (Japan). Dept. of Nanotechnology for Sustainable Energy
Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.

The loss-less electrical current-carrying capability of type II superconductors, measured by the critical current density J_c, can be increased by engineering desirable defects in superconductors to pin the magnetic vortices. Here, we demonstrate that such desirable defects can be created in superconducting FeSe_0.5Te_0.5 films by 6 MeV Au-ions irradiations that produce cluster-like defects with sizes of 10–15 nm over the entire film. The pristine FeSe_0.5Te_0.5 film exhibits a low anisotropy in the angular dependence of J_c. A clear improvement in the J_c is observed upon Au-ion irradiation for all field orientations at 4.2 K. Furthermore, a nearly 70% increase in J_c is observed at a magnetic field of 9 T applied parallel to the crystallographic c-axis at 10 K with little reduction of the superconducting transition temperature T_c. Our studies show that a dose of 1×10¹² Au cm^–2 irradiation at a few MeV is sufficient in order to provide a strong isotropic pinning defect landscape in iron-based superconducting films.

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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) (SC-22). Materials Sciences & Engineering Division; New York State Energy Research and Development Authority (NYSERDA); Japan Society for the Promotion of Science (JSPS)

Grant/Contract Number:: SC00112704; 17H04980

OSTI ID:: 1426458

Report Number(s):: BNL-203347-2018-JAAM

Journal Information:: Superconductor Science and Technology, Vol. 31, Issue 2; ISSN 0953-2048

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Fe-based superconducting thin films on metallic substrates: Growth, characteristics, and relevant properties Iida, Kazumasa; Hänisch, Jens; Tarantini, Chiara Applied Physics Reviews, Vol. 5, Issue 3 https://doi.org/10.1063/1.5032258	journal	September 2018

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Title: Enhanced critical current in superconducting FeSe0.5 Te 0.5 films at all magnetic field orientations by scalable gold ion irradiation

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