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Title: Doubling the critical current density in superconducting FeSe 0.5Te 0.5 thin films by low temperature oxygen annealing

Iron chalcogenide superconducting thin films and coated conductors are attractive for potential high field applications at liquid helium temperature for their high critical current densities J c, low anisotropies, and relatively strong grain couplings. Embedding flux pinning defects is a general approach to increase the in-field performance of superconductors. However, many effective pinning defects can adversely affect the zero field or self-field J c, particularly in cuprate high temperature superconductors. Here, we report the doubling of the self-field J c in FeSe 0.5Te 0.5 films by low temperature oxygen annealing, reaching ~3 MA/cm 2. In-field performance is also dramatically enhanced. In conclusion, our results demonstrate that low temperature oxygen annealing is a simple and cost-efficient post-treatment technique which can greatly help to accelerate the potential high field applications of the iron-based superconductors.
Authors:
 [1] ;  [2] ;  [2]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.; Stony Brook Univ., NY (United States). Dept. of Materials Science and Engineering Dept.
  2. Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept
Publication Date:
Report Number(s):
BNL-113428-2017-JA
Journal ID: ISSN 0003-6951; R&D Project: MA012MABA; KC0202050; TRN: US1701254
Grant/Contract Number:
SC0012704
Type:
Accepted Manuscript
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 109; Journal Issue: 20; Journal ID: ISSN 0003-6951
Publisher:
American Institute of Physics (AIP)
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; 36 MATERIALS SCIENCE
OSTI Identifier:
1342634