Global and local critical current density in superconducting SmFeAsO$_{1-x}$F$_x$ measured by two methods

E. S. Otabe; M. Kiuchi; S. Kawai; Y. Morita; J. Ge; B. Ni; Z. Gao; L. Wang; Y. Qi; X. Zhang; Y. Ma

doi:10.1016/j.physc.2009.06.013

paper

Global and local critical current density in superconducting SmFeAsO $_{1 - x}$ F $_{x}$ measured by two methods

arXiv:0902.1214 · doi:10.1016/j.physc.2009.06.013

Abstract

The critical current densities of polycrystalline bulk SmFeAsO $_{1 - x}$ F $_{x}$ prepared by the powder-in-tube (PIT) method and by a conventional solid-state reaction were investigated using the remnant magnetic moment method and Campbell's method. Two types of shielding current, corresponding to global and local critical current densities $J_{c}$ were observed using both measurement methods. The global and local $J_{c}$ were on the order of $1 0^{7}$ A/m $^{2}$ and $1 0^{10}$ A/m $^{2}$ at 5 K, respectively. The local $J_{c}$ decreased slightly with increasing magnetic field. The global $J_{c}$ was independent of the preparation method, while the local $J_{c}$ was larger for samples prepared by PIT than for those prepared by solid-state reaction.

arXiv comment20 pages, 5 figures. to be published in Physica C

Global and local critical current density in superconducting SmFeAsO $_{1 - x}$ F $_{x}$ measured by two methods

Abstract

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Global and local critical current density in superconducting SmFeAsO1−x​Fx​ measured by two methods

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Global and local critical current density in superconducting SmFeAsO $_{1 - x}$ F $_{x}$ measured by two methods