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采用固相反应法制备了高温超导YBa2Cu3O7-x多晶块材,并对YBa2Cu3O7-x多晶块材中的激光感生电压(LIV)效应进行了探究。首次在斜切角α(α～20°)的YBa2Cu3O7-x多晶块材中测量到了LIV信号,且在能量密度为47 mJ/cm2的紫外脉冲激光照射下,峰值电压为26.7 mV,上升沿为30 ns,半高宽为56 ns;信号峰值与斜切角α密切相关,并且与入射激光能量几乎呈线性增大。YBa2Cu3O7-x多晶块材中的LIV信号起源于热电各向异性,同时,对YBa2Cu3O7-x多晶块材和薄膜中的LIV信号做了对比研究,发现了多晶中的信号比薄膜中的小。
High-temperature superconducting YBa2Cu3O7-x polycrystalline blocks were prepared by solid-state reaction and laser induced voltage (LIV) effects in YBa2Cu3O7-x polycrystalline blocks were investigated. For the first time, the LIV signal was measured in the YBa2Cu3O7-x polycrystalline block with the bevel angle α (α ~ 20 °), and the peak voltage was 26.7 mV under the irradiation of ultraviolet pulsed laser with an energy density of 47 mJ / cm2. Is 30 ns, and the full width at half maximum is 56 ns. The signal peak is closely related to the bevel angle α and almost linearly increases with incident laser energy. The LIV signal in YBa2Cu3O7-x polycrystalline blocks originates from the thermoelectric anisotropy. At the same time, the LIV signals in the YBa2Cu3O7-x polycrystalline bulk and thin films are compared and the signal in the polycrystalline is found to be smaller than that in the thin films small.