Flux pinning in ternary (Nd–Eu–Gd)Ba2Cu3O7−δ: Optimization for the highest pinning
Flux pinning in ternary (Nd–Eu–Gd)Ba2Cu3O7−δ: Optimization for the highest pinning
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DOI：
10.1063/1.1312863
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发表时间：
2000-09
影响因子：
4
通讯作者：
A. Pradhan;M. Muralidhar;Yong Feng;M. Murakami;K. Nakao;N. Koshizuka
中科院分区：
文献类型：
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作者：
A. Pradhan;M. Muralidhar;Yong Feng;M. Murakami;K. Nakao;N. Koshizuka
优化了高质量的熔体加工三元（Nd-Eu-Gd）Ba 2Cu 3 O 7 −δ复合材料样品，以实现最大钉扎。我们的研究结果表明，孪晶面和精细的第二相沉淀物之间的相互作用形成了一个强烈的钉扎纠缠涡旋液体中的涡旋是相关的沿着c轴。这种被钉扎的涡旋液体在低温下冻结成玻璃态，从而产生高临界电流密度Jc。最大的Jc可以实现在生长的最佳退火孪晶样品与第二相沉淀，而不干扰孪晶的影响。
The optimization of high-quality melt-processed ternary (Nd–Eu–Gd)Ba2Cu3O7−δ composite samples has been carried out to achieve the largest pinning. Our results suggest that the interaction between the twin planes and the fine second-phase precipitate forms a strongly pinned entangled vortex liquid in which vortices are correlated along the c axis. This pinned vortex liquid freezes into a glassy state at low temperature rendering high critical current density, Jc. The maximum Jc can be achieved in as-grown optimally annealed twinned sample with second phase precipitate without disturbing the twin influence.