Observation of supercurrent distribution in YBa 2 Cu 3 O 7 2 d thin films using THz radiation excited with femtosecond laser pulses
Observation of supercurrent distribution in YBa 2 Cu 3 O 7 2 d thin films using THz radiation excited with femtosecond laser pulses
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使用飞秒激光脉冲激发的太赫兹辐射观察 YBa 2 Cu 3 O 7 2 d 薄膜中的超电流分布
DOI：
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发表时间：
1999
期刊：
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通讯作者：
K. Sakai
中科院分区：
文献类型：
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作者：
S. Shikii;T. Kondo;M. Yamashita;M. Tonouchi;M. Hangyob;K. Sakai
通过测量飞秒激光脉冲激发的THz电磁脉冲的辐射功率，可以得到电流偏置YBa 2Cu 3 O 72 d薄膜中的超电流分布.由于辐射功率与激光光斑位置处的偏置电流密度的平方成正比，因此通过扫描激光光斑，可以从太赫兹辐射的强度分布获得二维电流分布。利用临界态模型分析了超导体的特征超电流分布。© 1999年美国物理研究所。@S0003-6951 ~99！04609-4#
We have demonstrated that the supercurrent distribution in current-biased YBa 2Cu3O72d thin films can be obtained by measuring the radiation power of THz electromagnetic pulses excited with femtosecond laser pulses. As the radiation power is proportional to the square of the bias current density at the laser spot position, the two-dimensional current distribution can be obtained from the intensity distribution of THz radiation by scanning the laser spot. The characteristic supercurrent distribution is analyzed by using the critical-state model. © 1999 American Institute of Physics. @S0003-6951 ~99!04609-4#