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首页> 外文期刊>Physica, C. Superconductivity and its applications >Effect of post-annealing treatment on superconducting properties of Sr2AlTaO6/NdBa2Cu3O7-delta multilayers
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Effect of post-annealing treatment on superconducting properties of Sr2AlTaO6/NdBa2Cu3O7-delta multilayers

机译：后退火处理对Sr2AlTaO6 /NdBa2Cu3O7-δ多层膜超导性能的影响

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On the basis of successful fabrication of multilayer structures incorporating NdBa2Cu3O7-delta (NBCO) and Sr2AlTaO6 (SAT) insulator layers, we have systematically investigated the effect of post-annealing process on the superconducting properties of multilayers. All-epitaxial structures with sharp interfaces of SAT/NBCO multilayers were verified by transmission electron microscopy (TEM) observations. Due to the high stability and crystallinity of SAT insulator layers oxygen diffusion through these layers into the bottom NBCO layers became difficult. Thus, post-annealing experiments for bilayers were carried out in an oxygen atmosphere at different temperatures and for different time periods to optimize the superconducting properties of the bottom NBCO layers. It was found that the superconducting properties of bottom NBCO layers in naturally cooled as-grown bilayers were quite poor due to oxygen deficiency. The transition temperature T-c measured by a SQUID magnetometer was only 50-60 K. At the optimum annealing temperature of 450 degrees C, as the annealing lime is increased, the T-c also increased. After annealing for 5 h, the T-c reached a nearly saturated value of 90.5 K. From the measured magnetization hysteresis loop for an SAT/NBCO bilayer, the calculated critical current density was 2.8 x 10(6) A/cm(2) at 77 K and the applied magnetic field of H = 100 G. These values were comparable to those of NBCO single layers deposited on La-Sr2AlTaO6 and SrTiO3 (100) substrates. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 12]
机译：在成功制造包含NdBa2Cu3O7-δ（NBCO）和Sr2AlTaO6（SAT）绝缘体层的多层结构的基础上，我们系统地研究了后退火工艺对多层超导性能的影响。通过透射电子显微镜（TEM）观察证实了SAT / NBCO多层具有清晰界面的全外延结构。由于SAT绝缘层的高稳定性和结晶性，氧难以通过这些层扩散到底部NBCO层中。因此，在氧气氛中在不同温度和不同时间段进行双层的后退火实验，以优化底部NBCO层的超导性能。结果发现，由于氧气不足，自然冷却的双层中底部NBCO层的超导性能非常差。用SQUID磁力计测量的转变温度T-c只有50-60K。在450℃的最佳退火温度下，随着退火石灰的增加，T-c也增加。退火5小时后，Tc达到接近90.5 K的饱和值。从测得的SAT / NBCO双层磁化磁滞回线中，计算出的临界电流密度为2.8 x 10（6）A / cm（2），在77 K和施加的磁场H = 100G。这些值与La-Sr2AlTaO6和SrTiO3（100）衬底上沉积的NBCO单层的值相当。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：12]

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