体超导铟对一维锌超导纳米线超导电性的抑制效应

Suppression of superconductivity in zinc nanowires by bulk indium superconductors

文章细致研究了超导体铟/一维锌超导纳米线阵列/超导体铟夹心结构的超导电性.实验发现,当锌纳米线的长度在2—6μm、直径等于40nm时,宏观尺寸的超导体铟电极对中间的锌纳米线的超导电性具有反常的抑制作用.即当铟处在超导态时,中间的锌纳米线则停留在正常态.如果施加一个磁场,使超导体铟电极变为正常态,锌纳米线则恢复其超导电性.这种奇异的现象与超导电极材料的类型及锌纳米线的直径和长度有关.

The transport properties were measured in a system consisting of a zinc nanowire array sandwiched between two bulk superconductors. It was found that the superconductivity of Zn nanowires of 40 nm diameter is suppressed either completely or partially by the bulk superconductors. When the latter are driven into their normal state by a magnetic field, the nanowires switch back to their superconducting state. This novel phenomenon is not seen in wires with diameters equal to or thicker than 70 nm.