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arXiv 0902.1214cond-mat.supr-con
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用两种方法测量超导体SmFeAsO $_{1-x}$ F $_x$的全局和局部临界电流密度

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

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20 pages, 5 figures. to be published in Physica C
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摘要：

采用剩余磁矩法和Campbell法研究了粉末管法和传统固相反应法制备的SmFeAsO $_{1-x}$ F $_x$多晶块体的临界电流密度。使用这两种测量方法观察到两种类型的屏蔽电流，对应于全局和局部临界电流密度$J_{\rm c}$。在5 K时，整体和局部$J_{\rm c}$分别为$10^7$ A/m $^2$和$10^{10}$ A/m $^2$。局部$J_{\rm c}$随磁场增加而略有降低。整体的$J_{\rm c}$是独立的制备方法，而局部的$J_{\rm c}$是由PIT制备的样品比由固相反应制备的样品更大。

英文摘要：

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 $J_{\rm c}$ were observed using both measurement methods. The global and local $J_{\rm c}$ were on the order of $10^7$ A/m$^2$ and $10^{10}$ A/m$^2$ at 5 K, respectively. The local $J_{\rm c}$ decreased slightly with increasing magnetic field. The global $J_{\rm c}$ was independent of the preparation method, while the local $J_{\rm c}$ was larger for samples prepared by PIT than for those prepared by solid-state reaction.

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