Large transport Jc in Sn-added SmFeAsO1-xF x tapes prepared by an ex situ PIT method

Chunlei Wang, Chao Yao, He Lin, Xianping Zhang, Qianjun Zhang, Dongliang Wang, Yanwei Ma, S. Awaji, K. Watanabe, Y. Tsuchiya, Y. Sun, T. Tamegai

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14 Citations (Scopus)

Abstract

SmFeAsO1-xFx possesses the highest superconducting transition temperature (Tc) among the iron-based superconductors, with a very high upper critical field and critical current density (Jc). All these are desirable for practical applications. Although tremendous progress has been made in improving the Jc values for Sr(Ba)-122 tapes or wires [1-3], the transport Jc of Sm1111 tapes or wires is still very low. Here we report on large transport critical current densities observed in Sn-added SmFeAsO1-xFx/Fe tapes produced by an ex situ powder-in-tube (PIT) method. It was found that the loss of fluorine was reduced and the intergranular coupling was enhanced in the Sn-added samples. As a result, the onset and offset Tc values for 10 wt%, 20 wt% and 30 wt% Sn-added samples were 52 K and 35 K, 53 K and 39 K, and 54 K and 41.5 K, respectively. In particular, a transport Jc as large as 22 000 A cm-2 (Ic = 160 A) at 4.2 K under self-field was achieved in 30 wt% Sn-added specimens, which is the highest value reported so far for SmFeAsO1-xFx wires and tapes. Magneto-optical imaging further showed that there were large global currents over the whole sample, which is consistent with the results obtained by the four-probe method.

Original languageEnglish
Article number075017
JournalSuperconductor Science and Technology
Volume26
Issue number7
DOIs
Publication statusPublished - 2013 Jul 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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    Wang, C., Yao, C., Lin, H., Zhang, X., Zhang, Q., Wang, D., Ma, Y., Awaji, S., Watanabe, K., Tsuchiya, Y., Sun, Y., & Tamegai, T. (2013). Large transport Jc in Sn-added SmFeAsO1-xF x tapes prepared by an ex situ PIT method. Superconductor Science and Technology, 26(7), [075017]. https://doi.org/10.1088/0953-2048/26/7/075017