NDLI: Estimation of Critical Current Densities in Polycrystalline <formula formulatype=inline><tex Notation=TeX>${rm Sr}_{0.6}{rm K}_{0.4}{rm Fe}_{2}{rm As}

Content Provider	IEEE Xplore Digital Library
Author	Baorong Ni Jun Ge Tanaka, Y. Otabe, E.S. Kiuchi, M. Matsushita, T. Zhaoshun Gao Lei Wang Yanpeng Qi Xianping Zhang Yanwei Ma
Copyright Year	2002
Abstract	The superconducting Sr_0.6K_0.4Fe₂As₂ (122 type) polycrystalline iron-based pnictides with Pb or Ag addition were prepared by a normal PIT method. The critical current densities were investigated by ac inductive (Campbell's) method. It was found that a fairly large critical current density over 10¹⁰ A/m² even at the relatively high temperatures flows locally with the perimeter size similar to the average grain size of the bulk samples, while an extremely low global critical current density of 10⁴10⁶ A/m² flows through the whole sample. Furthermore, a unique history dependence of global critical current density was observed, i.e., it shows a smaller critical current density in the increasing-field process than that in the decreasing-field process. Basing on the experimental results of the penetrating ac magnetic flux profile and the characteristic of ac magnetic field vs. penetration depth, the inter- and intra-granular super-current, the weak-link and the history effect in these materials were discussed.
Sponsorship	Council on Superconductivity Appl. Superconductivity Conference Inc MIT
Starting Page	2862
Ending Page	2865
Page Count	4
File Size	486689
File Format	PDF
ISSN	10518223
Volume Number	21
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2011-06-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Superconducting magnets Critical current density Grain size Lead History Magnetic resonance imaging Magnetic shielding weak-link property Campbell's method global and local critical current densities iron-based pnictides
Content Type	Text
Resource Type	Article
Subject	Condensed Matter Physics Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Estimation of Critical Current Densities in Polycrystalline ${rm Sr}_{0.6}{rm K}_{0.4}{rm Fe}_{2}{rm As}_{2}$ Superconductors

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