...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Physica, C. Superconductivity and its applications >Intergranular flux pinning in underdoped and overcloped R1-xCaxBa2Cu3Oz (R = Y, Gd; x=0, 0.2) samples
【24h】

Intergranular flux pinning in underdoped and overcloped R1-xCaxBa2Cu3Oz (R = Y, Gd; x=0, 0.2) samples

机译：掺杂不足和过度闭合的R1-xCaxBa2Cu3Oz（R = Y，Gd; x = 0，0.2）样品中的晶间通量钉扎

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

The temperature dependences of AC magnetic susceptibility at different magnetic field amplitudes and frequencies are investigated for underdoped and overdoped R(1-x)CaxBa2Cu3Oz (R = Y; Gd and x = 0, 0.2) polycrystalline samples. The activation energy, E,, for thermally assisted flux flow (TAFF) in intergranular region is determined. It was established that a correlation exists between the intergranular critical current and flux pinning activation energy. In underdoped samples the intergranular current shows S-I-S behaviour and the activation energy is small, while in overdoped samples the intergranular current is changed to S-N-S type and the activation energy increases. 2D pancake vortices are characteristic of underdoped samples, while 3D vortex system exists in overdoped samples. In fact we demonstrate that Ca substitution not only increases carrier concentration, but also improves intergranular activation energy for TAFF. (c) 2008 Elsevier B.V. All rights reserved.
机译：对于掺杂不足和掺杂过量的R（1-x）CaxBa2Cu3Oz（R = Y; Gd和x = 0，0.2）多晶样品，研究了在不同磁场幅度和频率下交流磁化率的温度依赖性。确定了晶间区域中热辅助通量（TAFF）的活化能E。已经确定，晶间临界电流与磁通钉扎激活能之间存在相关性。在掺杂不足的样品中，晶间电流表现出S-I-S行为，活化能小;而在掺杂过量的样品中，晶间电流变为S-N-S型，活化能增加。 2D煎饼旋涡是掺杂不足样品的特征，而3D涡旋系统存在于掺杂过量的样品中。实际上，我们证明了Ca取代不仅增加了载流子浓度，而且还改善了TAFF的晶间活化能。 （c）2008 Elsevier B.V.保留所有权利。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号