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Title: High-field critical current enhancement by irradiation induced correlated and random defects in (Ba{sub 0.6}K{sub 0.4})Fe{sub 2}As{sub 2}

Mixed pinning landscapes in superconductors are emerging as an effective strategy to achieve high critical currents in high, applied magnetic fields. Here, we use heavy-ion and proton irradiation to create correlated and point defects to explore the vortex pinning behavior of each and combined constituent defects in the iron-based superconductor Ba{sub 0.6}K{sub 0.4}Fe{sub 2}As{sub 2} and find that the pinning mechanisms are non-additive. The major effect of p-irradiation in mixed pinning landscapes is the generation of field-independent critical currents in very high fields. At 7 T ‖ c and 5 K, the critical current density exceeds 5 MA/cm{sup 2}.
Authors:
;  [1] ;  [2] ; ; ; ; ; ;  [1] ;  [3] ;  [4] ;  [5]
  1. Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  2. (United States)
  3. Department of Physics, Western Michigan University, Kalamazoo, Michigan 49008 (United States)
  4. Physics Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
  5. National Laboratory of Solid State Microstructures, Department of Physics, Center for Superconducting Physics and Materials, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22217809
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADDITIVES; CRITICAL CURRENT; HEAVY IONS; IRON; IRON ARSENIDES; IRRADIATION; MAGNETIC FIELDS; MAGNETIC FLUX; MAGNETIZATION; POINT DEFECTS; PROTONS; SUPERCONDUCTIVITY