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

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 1×10 12 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.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [2] ;  [2] ;  [2] ;  [2]
  1. 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
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
Publication Date:
Report Number(s):
BNL-203347-2018-JAAM
Journal ID: ISSN 0953-2048
Grant/Contract Number:
SC00112704; 17H04980
Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 31; Journal Issue: 2; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Research Org:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Org:
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)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; 36 MATERIALS SCIENCE
OSTI Identifier:
1426458

Ozaki, Toshinori, Wu, Lijun, Zhang, Cheng, Si, Weidong, Jie, Qing, and Li, Qiang. Enhanced critical current in superconducting FeSe0.5 Te 0.5 films at all magnetic field orientations by scalable gold ion irradiation. United States: N. p., Web. doi:10.1088/1361-6668/aaa3c4.
Ozaki, Toshinori, Wu, Lijun, Zhang, Cheng, Si, Weidong, Jie, Qing, & Li, Qiang. Enhanced critical current in superconducting FeSe0.5 Te 0.5 films at all magnetic field orientations by scalable gold ion irradiation. United States. doi:10.1088/1361-6668/aaa3c4.
Ozaki, Toshinori, Wu, Lijun, Zhang, Cheng, Si, Weidong, Jie, Qing, and Li, Qiang. 2018. "Enhanced critical current in superconducting FeSe0.5 Te 0.5 films at all magnetic field orientations by scalable gold ion irradiation". United States. doi:10.1088/1361-6668/aaa3c4.
@article{osti_1426458,
title = {Enhanced critical current in superconducting FeSe0.5 Te 0.5 films at all magnetic field orientations by scalable gold ion irradiation},
author = {Ozaki, Toshinori and Wu, Lijun and Zhang, Cheng and Si, Weidong and Jie, Qing and Li, Qiang},
abstractNote = {The loss-less electrical current-carrying capability of type II superconductors, measured by the critical current density Jc, 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 FeSe0.5Te0.5 films by 6 MeV Au-ions irradiations that produce cluster-like defects with sizes of 10–15 nm over the entire film. The pristine FeSe0.5Te0.5 film exhibits a low anisotropy in the angular dependence of Jc. A clear improvement in the Jc is observed upon Au-ion irradiation for all field orientations at 4.2 K. Furthermore, a nearly 70% increase in Jc 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 Tc. 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.},
doi = {10.1088/1361-6668/aaa3c4},
journal = {Superconductor Science and Technology},
number = 2,
volume = 31,
place = {United States},
year = {2018},
month = {1}
}