Liquid-gated interface superconductivity on an atomically flat film
Liquid-gated interface superconductivity on an atomically flat film
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DOI：
10.1038/nmat2587
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发表时间：
2010-02-01
期刊：
影响因子：
41.2
通讯作者：
Iwasa, Y.
中科院分区：
文献类型：
--
作者：
Ye, J. T.;Inoue, S.;Iwasa, Y.
液/固界面不仅在催化活性和能量存储方面的应用引起了越来越多的兴趣（1,2），而且在双电层晶体管（edlt）中具有新的电子功能，例如高性能有机电子学（3-7），场致电子相变（8-11），以及SrTiO中的超导性(3)（参考文献12）。拓宽edlt以诱导其他材料的超导性是丰富超导体材料科学的迫切需要。然而，材料和加工技术的选择不足严重阻碍了它（13）。本文介绍了一种简单的方法，使用离子液体作为栅介质，机械微解理技术进行表面制备，并报道了在层状氮化化合物ZrNCl的原子平面膜上观察到的场致超导性，其转变温度为T(c) = 15.2 K。目前的结果表明，EDLT是一种非常通用的工具，可以通过静电电荷积累来诱导电子相变，并为寻找传统化学方法合成的超导体提供了新的途径。
Liquid/solid interfaces are attracting growing interest not only for applications in catalytic activities and energy storage(1,2), but also for their new electronic functions in electric double-layer transistors (EDLTs) exemplified by high-performance organic electronics(3-7), field-induced electronic phase transitions(8-11), as well as superconductivity in SrTiO(3) (ref. 12). Broadening EDLTs to induce superconductivity within other materials is highly demanded for enriching the materials science of superconductors. However, it is severely hampered by inadequate choice of materials and processing techniques(13). Here we introduce an easy method using ionic liquids as gate dielectrics, mechanical micro-cleavage techniques for surface preparation, and report the observation of field-induced superconductivity showing a transition temperature T(c) = 15.2 K on an atomically flat film of layered nitride compound, ZrNCl. The present result reveals that the EDLT is an extremely versatile tool to induce electronic phase transitions by electrostatic charge accumulation and provides new routes in the search for superconductors beyond those synthesized by traditional chemical methods.