Global and local critical current density in superconducting SmFeAsO1−xFx measured by two methods
✍ Scribed by E.S. Otabe; M. Kiuchi; S. Kawai; Y. Morita; J. Ge; B. Ni; Z. Gao; L. Wang; Y. Qi; X. Zhang; Y. Ma
- Book ID
- 104084131
- Publisher
- Elsevier Science
- Year
- 2009
- Tongue
- English
- Weight
- 363 KB
- Volume
- 469
- Category
- Article
- ISSN
- 0921-4534
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✦ Synopsis
The critical current densities of polycrystalline bulk SmFeAsO 1Àx 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 10 7 A/m 2 and 10 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.