氧缺陷的YBa2Cu3O7-x高温超导体光辐照研究

利用Janis CCS-350制冷机(最低可达10 K)提供低温环境, 从室温到200 K, 利用真空泵持续抽取真空, 使氧缺陷YBa2Cu3O7-x(YBCO)超导体中的氧重新分布。实验表明, 在缺氧环境下, 样品氧缺陷现象加剧, 超导临界温度降低, 直至到正常态, 利用原位光辐照氧缺陷YBCO样品产生持续光电导效应或光诱导超导电性效应, 可以部分地抵消氧缺陷对超导电性所引起的破坏, 而对YBCO,x<0.1时, 其转变温度Tc高于90 K的样品, 在缺氧环境下, 样品氧缺陷现象变化和光辐照效应不明显。讨论了YBCO超导体在能隙比一般半导体光电材料至少要窄约二个数量级, 又具有较高的光学吸收系数的情况下, 光子作用下高温超导体内各种元激发之间的相互作用过程, 对实际应用YBCO超导体光学性能, 理解机制设计仪器有现实意义。

Study of the Photon Radiation and Superconductor of YBa2Cu3O7-x under the Oxygen Deficient Environment

Using Janis CCS-350 refrigerator (which lowest temperature is 10 K) to provide the low temperature environment, from room temperature to 200 K, then using the vacuum pump continuously to make the oxygen in the oxygen deficiency YBa2Cu3O7-x(YBCO) sample to redistribute. The experiments show that under the anoxia condition, the oxygen deficiency of the YBCO sample become worse. At the same time, the critical superconductive temperature become lower until to the normal status, and the situ photon radiation over the oxygen deficiency YBCO sample generates continuous photon conductive effect and photon induced superconductive effect, which can partly counteract the oxygen defect which induces destroy to the superconductivity. For YBCO when x is smaller then 0.1, the samples whose convert temperature Tc higher than 90 K have unobvious oxygen deficiency and photon radiation effect under the anoxia condition. It is discussed the reactions between different elements induced by photon effect in the YBCO superconductivities, under the situation that the energy gap is less than normal semiconductivities for at lest two orders, and the situation of higher photo absorption coefficients. It is helpful to the application of YBCO superconductivity and useful for understanding the mechanism of the high temperature superconductor.