Crossover from intrinsic to extrinsic pinning for YBa2Cu3O7 films
Crossover from intrinsic to extrinsic pinning for YBa2Cu3O7 films
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DOI：
10.1016/s0011-2275(99)00079-x
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发表时间：
1999-07-01
期刊：
影响因子：
2.1
通讯作者：
Kobayashi, N
中科院分区：
文献类型：
--
作者：
Awaji, S;Watanabe, K;Kobayashi, N
测量了具有不同钉扎强度的YBa_2Cu_3O_7薄膜的临界电流密度特性随磁场、温度和磁场角度的变化。我们发现在临界电流密度J（c）的温度依赖性中出现了一个扭结异常，并且出现这种异常的温度依赖于非本征钉扎强度。磁场和角度的J（c）的依赖性表明，异常是由于从本征到非本征钉扎的交叉。利用内、外钉扎竞争模型，成功地解释了一个扭结反常现象。(C)1999年日本低温协会。由Elsevier Science Ltd.出版，版权所有。
Critical current density properties for YBa2Cu3O7 films which have different pinning strength were measured as a function of magnetic field, temperature or magnetic field angle. We found that a kink anomaly appeared in the temperature dependence of critical current densities J(c) and that the temperature at which the anomaly appeared depended on the extrinsic pinning strength. The magnetic field and angular dependences of J(c) indicate that the anomaly is due to the crossover from the intrinsic to the extrinsic pinning. Using a competition model of the intrinsic and extrinsic pinning, a kink anomaly is explained successfully. (C) 1999 Cryogenic Association of Japan. Published by Elsevier Science Ltd. All rights reserved.