Ag掺杂的La_(0.67)Pb_(0.33)MnO_3薄膜中激光感生热电电压效应

Laser induced thermoelectric voltage effect in La_(0.67)Pb_ (0.33) MnO_3 thin films doped with Ag

采用脉冲激光沉积法在倾斜LaAlO3衬底上制备了Ag掺杂的La0.67Pb0.33MnO3(LPMO)系列薄膜,发现该类薄膜中有激光感生热电电压(LITV)效应.随着掺Ag量x(x为Ag的质量与LPMO的质量之比)从0.00增加到0.10,LPMO薄膜中的LITV信号的响应时间先递减后递增,但始终小于未掺Ag的薄膜,掺Ag量x=0.06时响应时间最小.研究发现LPMO薄膜存在一个最佳厚度,在这一厚度下可使得LITV信号的峰值电压、响应时间分别达到最大和最小.与相同掺Ag量的La0.67Ca0.33MnO3薄膜相比,LPMO薄膜中的LITV信号有更小的响应时间.

The La0.67 Pb0.33 MnO3 （LPMO） thin films doped with Ag on vicinal-cut LaAlO3 substrates were prepared using standard pulsed laser deposition technique, in which laser induced thermoelectric voltage （LITV） effect was found. With Ag doping level x （x is defined as, x = maSSAs/massLPMO ） increasing from 0.00 to 0.10, the response time of LITV signals in LPMO thin films firstly decreases （reaching minimum at 0.06）, and then increases （still less than that with zero Ag doping）. Further, an optimal film thickness was found, at which the peak voltage and response time of LITV signals to reaches maximum and minimum, respectively. The response time of LITV in the LPMO thin films are substantially smaller than that of La0.67 Ca0.33 MnO3 thin films at the same Ag doping level.