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Title: Enhancement of transport critical current density of SmFeAsO{sub 1−x}F{sub x} tapes fabricated by an ex-situ powder-in-tube method with a Sn-presintering process

SmFeAsO{sub 1−x}F{sub x} (Sm1111) tapes were prepared by an ex-situ powder-in-tube method with a Sn-presintering process. Scanning electron microscopy revealed apparent difference in microstructure between Sn-presintered tapes and the previously reported polycrystalline Sm1111 bulk, since Sn has reduced FeAs wetting phase and filled the voids between Sm1111 grains. The Sn-presintered tapes showed significant enhanced field dependences of transport J{sub c} compared with Sn-added tapes. A highest transport critical current density (J{sub c}) of 3.45 × 10{sup 4} A cm{sup −2} at 4.2 K and self-field is achieved. Magneto-optical imaging further confirmed large and well-distributed global and intergranular J{sub c} in Sn-presintered Sm1111 tapes.
Authors:
; ; ; ; ; ; ; ;  [1] ; ;  [2] ; ;  [3]
  1. Key Laboratory of Applied Superconductivity, Institute of Electrical Engineering, Chinese Academy of Sciences, Beijing 100190 (China)
  2. High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University, Sendai 980-8577 (Japan)
  3. Department of Applied Physics, The University of Tokyo, Hongo, Tokyo 113-8656 (Japan)
Publication Date:
OSTI Identifier:
22267750
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 17; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CRITICAL CURRENT; CURRENT DENSITY; IRON ARSENIDES; POLYCRYSTALS; SCANNING ELECTRON MICROSCOPY