基于脉冲强磁场的高温超导薄膜YBa_2Cu_3O_(6.45)霍尔效应研究

Research on Hall effect of HTS YBa_2Cu_3O_(6.45) film on the base of high pulsed magnetic field

对高温超导材料常态特性的研究与理解,将会对超导电性机理本身的研究提供关键参考信息。在常态特性研究中,以常态电荷传输特性尤其是霍尔效应的测量最为引人注目。然而,T<Tc时试样常态特征被材料本身的超导电性掩盖了,为获得材料在Tc温度以下的常态特性,我们在高达50T的脉冲强磁场中进行霍尔效应测量,可有效抑制超导电性。本文主要介绍了50T左右脉冲强磁场的实验技术,特别是脉冲磁体、实验探针及测量线路的设计。随后,对高温超导薄膜YBa2Cu3O6.45在强磁场中的霍尔效应测量进行了详细阐述。

The understanding of mechanisms responsible for the appearance of the normal-state properties may provide key information about the nature of the superconducting mechanism itself. One physical property that has attracted much attention was the normal-state Hall effect. However, the Hall effect at T〈Tc was hidden behind the superconducting state. To gain access to the normal-state Hall effect at T〈Tc, the transport experiments are carried out in high pulsed magnetic field up to 50T in order to suppress superconductivity. The aim of this work was to present the transport experimental techniques, especially design of pulsed magnets, probes and measuring circuits. Furthermore, measurements of normal-state resistivity of HTS film YBa2 Cu3O6.45 were expounded in detail.