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Terahertz Radiation Properties of Underdoped YBa2Cu3O7-δ Thin Films
並列摘要
Terahertz (THz)-wave pulse radiation properties by femtosecond optical pulse excitation were investigated on high-Tc superconductors. For the measurements three kinds of underdoped YBa2Cu3O7-δ (YBCO) thin films with superconducting transition temperatures of Tc = 84.0K, 61.5K and 52.4K 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 Tc = 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.
並列關鍵字
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延伸閱讀
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