Laser-induced thermoelectric voltage in normal state MgB₂ thin films

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• 作者：Songqing Zhao ; Yueliang Zhou ; Kun Zhao ; Shufang Wang ; Zhenghao Chen ; Kui-juan Jin ; Huibin Lü ; Bolin Cheng ; Guozhen Yang
• 关键词：MgB₂ thin films ; Laser-induced voltage ; Thermoelectric effect
• 刊名：Applied Surface Science
• 出版年：2006
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：30 December 2006
• 卷：253
• 期：5
• 页码：2671-2673
• 文件大小：331 K

摘要

Laser-induced voltage has been observed in c-axis oriented MgB₂ thin film at room temperature. The amplitude of the signal is approximately proportional to the film thickness. For the film with the thickness of 150 nm, a very fast response has been detected when the film was irradiated by a 308 nm pulsed laser of 20 ns duration. The rise time and full width at half-maximum of the signal are about 3 and 25 ns, respectively. The physical origin of the laser-induced voltage can be attributed to a transverse thermoelectricity due to the anisotropic thermopower in MgB₂.