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首页> 外文期刊>Physica, C. Superconductivity and its applications >Fundamental and harmonic AC responses to different annealing rates of Bi2Sr2CaCu2O8 single crystals
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Fundamental and harmonic AC responses to different annealing rates of Bi2Sr2CaCu2O8 single crystals

机译:Bi2Sr2CaCu2O8单晶对不同退火速率的基本交流AC响应

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Three Bi2Sr2CaCu2O8 single crystals with different annealing processes have been measured in terms of complex AC susceptibilities chi (n) = chi'(n) - i chi " (n) (n = 1,3) to reveal the effect of flux-pinning strength. The third harmonic susceptibility changes dramatically when the pinning strengths are different due to different annealing processes, although the fundamental susceptibilities are quite similar. The experimental data are explained by the calculations based on finite thickness type-II superconductors in the presence of a geometric barrier. It has been found that the temperature dependence of the third harmonic susceptibility of the crystals follows the model predictions. When the sample is slowly cooled, the geometric barrier plays a significant role in the third harmonic AC susceptibility. Its effect is suppressed when the single crystals are cooled rapidly from high temperature. (C) 2001 Elsevier Science B.V. All rights reserved. [References: 25]
机译:根据复杂的交流磁化率,测量了三种具有不同退火工艺的Bi2Sr2CaCu2O8单晶chi(n)= chi'(n)-i chi“(n)(n = 1,3),以揭示助焊剂固定强度的影响尽管基本磁化率非常相似,但由于不同的退火工艺,由于不同的退火工艺,当钉扎强度不同时,三次谐波的磁化率会发生巨大变化,实验数据通过在存在几何势垒的情况下基于有限厚度的II型超导体的计算来解释。结果发现,晶体的三次谐波磁化率与温度的关系符合模型预测,当样品缓慢冷却时,几何势垒在三次谐波交流磁化率中起着重要作用,单次单晶时其势垒被抑制。晶体从高温迅速冷却。(C)2001 Elsevier Science BV保留所有权利[参考文献:25]

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