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首页> 外文期刊>Physica, C. Superconductivity and its applications >Pinning, thermally activated depinning and their importance for tuning the nanoprecipitate size and density in high J(c) YBa2Cu3O7-x films
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Pinning, thermally activated depinning and their importance for tuning the nanoprecipitate size and density in high J(c) YBa2Cu3O7-x films

机译：钉扎，热活化脱钉及其对调整高J（c）YBa2Cu3O7-x膜中纳米沉淀物的尺寸和密度的重要性

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YBa2Cu3O7-x (Y123) films with quantitatively controlled artificial nanoprecipitate pinning centers were grown by pulsed laser deposition (PLD) and characterized by transport over wide temperature (T) and magnetic field (H) ranges and by transmission electron microscopy (TEM). The critical current density J(c) was found to be determined by the interplay of strong vortex pinning and thermally activated depinning (TAD), which together produced a non-monotonic dependence of J(c) on c-axis pin spacing d(c). At low T and H,J(c) increased with decreasing d(c), reaching the very high J(c) similar to 48 MA/cm(2) similar to 20% of the depairing current density J(d) at 10 K, self-field and d(c) similar to 10 nm, but at higher T and H when TAD effects become significant, J(c) was optimized at larger d(c) because longer vortex segments confined between nanoprecipitates are less prone to thermal fluctuations. We conclude that precipitates should extend at least several coherence lengths along vortices in order to produce irreversibility fields H-irr(77 K) greater than 7 T and maximum bulk pinning forces F-p,F-max(77 K) greater than 7-8 GN/m(3) (values appropriate for H parallel to the c-axis). Our results show that there is no universal pin array that optimizes J(c) at all T and H.
机译：通过脉冲激光沉积（PLD）生长具有定量控制的人工纳米沉淀钉扎中心的YBa2Cu3O7-x（Y123）膜，并通过在宽温度（T）和磁场（H）范围内的传输以及通过透射电子显微镜（TEM）对其进行表征。发现临界电流密度J（c）由强涡旋钉扎和热激活脱钉（TAD）的相互作用确定，二者共同产生了J（c）对c轴针间距d（c ）。在低T和H下，J（c）随着d（c）的减小而增加，达到非常高的J（c），类似于48 MA / cm（2），类似于10时的去耦电流密度J（d）的20％ K，自场和d（c）近似于10 nm，但是当TAD效应变得显着时，在较高的T和H处，在较大的d（c）下对J（c）进行了优化，因为限制在纳米沉淀之间的较长涡旋段不易产生热波动。我们得出的结论是，析出物应沿着涡旋至少延伸几个相干长度，以便产生大于7 T的不可逆场H-irr（77 K）和大于7-8 GN的最大体钉扎力Fp，F-max（77 K） / m（3）（适用于平行于c轴的H的值）。我们的结果表明，没有通用引脚阵列可以在所有T和H处优化J（c）。

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