波士顿东北大学的研究人员认为,超导体的特性可能与夹在钽原子层或铋原子层之间的氧化铜平面的数目有关。这一现象对氧化铜层数在4以下的情况都成立,但当氧化铜层数为5时便不再成立。当夹在钽原子层或铋原子层之间的氧化铜层的数目从2增加到3、然后又增加到4时,超导转变温度便从90°K 上升到110°K 又上升到122°K。日本茨城电气技术研究所的一个研究小组发现,在有5层氧化铜的一种类似的化合物中,超导转变温度却低于 Researchers at Northeastern University in Boston believe that the superconductor’s properties may be related to the number of copper oxide planes sandwiched between tantalum atomic layers or bismuth atomic layers. This phenomenon holds true for the case where the number of copper oxide layers is 4 or less, but no longer holds when the number of copper oxide layers is 5. When the number of copper oxide layers sandwiched between tantalum atomic layers or atomic layers of bismuth increased from 2 to 3 and then increased to 4, the superconducting transition temperature increased from 90 ° K to 110 ° K and again to 122 ° K. A research team at Ibaraki Institute of Electrical Technology in Japan found that in a similar compound with five layers of copper oxide, the superconducting transition temperature was lower than