Terahertz radiation properties of underdoped YBa2Cu3O7-δ thin films

被引：0
|
作者：
Tominari, Y
Murakami, H
Tonouchi, M
机构：
[1] Osaka Univ, Res Ctr Supercond Photon, Suita, Osaka 5650871, Japan
[2] CREST, Japan Sci & Technol Corp, Suita, Osaka 5650871, Japan
来源：
CHINESE JOURNAL OF PHYSICS | 2004年 / 42卷 / 04期
关键词：
D O I：
暂无
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Terahertz (THz)-wave pulse radiation properties by femtosecond optical pulse excitation were investigated on high-T-c superconductors. For the measurements three kinds of under-doped YBa2Cu3O7-delta (YBCO) thin films with superconducting transition temperatures of T-c = 84.0 K, 61.5 K and 52.4 K were prepared by annealing with a bulk YBCO sample under different reduced oxygen conditions. It was found that the amplitude of the radiated THz pulse strongly depends on the hole-doping level. The maximum radiation efficiency was obtained for a middle underdoped sample with. T-c = 61.5 K. The observed hole-doping dependence of radiation efficiency is qualitatively explained by the relation between the transmittance of YBCO and supercarrier density.
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页码：561 / 566
页数：6
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