Gigantic transverse voltage induced via off-diagonal thermoelectric effect in CaxCoO2 thin films
Gigantic transverse voltage induced via off-diagonal thermoelectric effect in CaxCoO2 thin films
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DOI：
10.1063/1.3464286
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发表时间：
2010-07-12
影响因子：
4
通讯作者：
Yamada, Yuka
中科院分区：
文献类型：
--
作者：
Takahashi, Kouhei;Kanno, Tsutomu;Yamada, Yuka
在具有倾斜c轴取向的CaxCoO 2薄膜中，在纳秒激光脉冲照射下观察到超过几十伏的巨大横向电压。电压信号是高度各向异性的膜表面内示出与c轴倾斜方向的密切关系。电压的大小和衰减时间强烈依赖于膜厚度。这些结果证实，大的激光感应电压源于称为非对角热电效应的现象，通过该现象，膜面外温度梯度导致膜面内电压的产生。(C)2010年美国物理学会。[doi：10.1063/1.3464286]
Gigantic transverse voltages exceeding several tens volt have been observed in CaxCoO2 thin films with tilted c-axis orientation upon illumination of nanosecond laser pulses. The voltage signals were highly anisotropic within the film surface showing close relation with the c-axis tilt direction. The magnitude and the decay time of the voltage strongly depended on the film thickness. These results confirm that the large laser-induced voltage originates from a phenomenon termed the off-diagonal thermoelectric effect, by which a film out-of-plane temperature gradient leads to generation of a film in-plane voltage. (C) 2010 American Institute of Physics. [doi:10.1063/1.3464286]