Dimensional Crossover Effect of Pinning in YBa2Cu3O7 Films
Dimensional Crossover Effect of Pinning in YBa2Cu3O7 Films
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YBa2Cu3O7 薄膜中钉扎的维度交叉效应
DOI：
10.1143/jjap.32.l1795
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发表时间：
1993
期刊：
影响因子：
--
通讯作者：
Toshio Hirai Toshio Hirai
中科院分区：
文献类型：
--
作者：
S. Awaji;Kazuo Watanabe;N. Kobayashi;Hisanori Yamane Hisanori Yamane;Toshio Hirai Toshio Hirai
通过四探针电阻法测量沉积在 SrTiO3(100) 基底上的化学气相沉积 (CVD) YBa2Cu3O7 薄膜中临界电流密度 Jc 的温度和场依赖性及其各向异性。 B⊥c 的 Jc 温度依赖性存在扭结，而 B//c 的 Jc 没有扭结。这种扭结可以解释为从三维 (3D) 钉扎到二维 (2D) 钉扎的维度交叉效应。在扭结出现的温度以下，二维钉扎会影响 Jc 属性。探讨了 3D 和 2D 情况下的钉扎模型，分别考虑了外部钉扎和内部钉扎。
Temperature and field dependence of the critical current density Jc and its anisotropy in chemical vapor deposition processed (CVD) YBa2Cu3O7 films deposited on SrTiO3(100) substrates were measured by a 4-probe resistive method. A kink in the temperature dependence of Jc was found for B⊥c, while there was no kink in Jc for B//c. This kink can be explained as the dimensional crossover effect from three-dimensional (3D) pinning to two-dimensional (2D) pinning. Below the temperature at which the kink appears, the 2D pinning affects the Jc properties. The pinning model for 3D and 2D cases is explored, considering the extrinsic pinning and the intrinsic one, respectively.