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随着陶瓷高温超导体的出现,人们实现了液氮温区的超导。然而,就目前的钇钡铜氧体系材料而言,距离实用化还有相当大的距离。首先是临界电流密度还不够大,临界磁场存在着各向异性。从工程角度上看,材料比较脆、加工性差、不够稳定等等。研究指出,材料的结构决定性能。究竟什么样的结构可以产生最佳的超导特性是人们迫切想知道的。因此,我们必须采用所有先进手段弄清超导体的结构。这对改进现有的材料和发现新材料是不可缺少的。
With the advent of ceramic high temperature superconductors, superconductivity has been achieved in the liquid nitrogen temperature region. However, in the current yttrium barium copper oxide system material, there is still a considerable distance from practical use. The first is that the critical current density is not large enough, and there is anisotropy in the critical magnetic field. From an engineering point of view, the material is relatively brittle, poor workability, not stable enough and so on. Research indicates that the structure of the material determines performance. What kind of structure can produce the best superconductivity is what people want to know. Therefore, we must use all the advanced means to understand the structure of superconductors. This is indispensable for improving existing materials and finding new materials.