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arXiv 2201.00990cond-mat.supr-con
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离子液体门控KTaO3表面的二维超导电性

Two-dimensional superconductivity at the surfaces of KTaO3 gated with ionic liquid

Tianshuang Ren, Miaocong Li, Xikang Sun, Lele Ju, Yuan Liu, Siyuan Hong, Yanqiu Sun, Qian Tao, Yi Zhou, Zhu-An Xu, Yanwu Xie

摘要:

最近在KTaO_3和EuO(或LaAlO_3)界面处观察到的超导电性提供了氧化物界面处涌现现象的新例子。这种超导电性表现出不寻常的强烈依赖于KTaO 3的晶体取向和其超导转变温度Tc是近一个数量级高于种子LaAlO 3/SrTiO 3界面。为了理解其机制,关键是要解决氧化物界面的形成是否是超导性存在所不可或缺的。在这里,通过利用离子液体(IL)门控,我们获得超导性在KTaO 3(111)和(110)表面的Tc分别高达2.0 K和1.0 K。这种无氧化物界面的超导电性给出了明确的实验证据,即KTaO_3界面超导电性的基本物理机制在于掺杂电子的KTaO_3表面。此外,在表面与IL控制超导电性的能力提供了一个简单的方法来研究KTaO 3的本征超导电性。

英文摘要:

The recent observation of superconductivity at the interfaces between KTaO3 and EuO (or LaAlO3) offers a new example of emergent phenomena at oxide interfaces. This superconductivity exhibits an unusual strong dependence on the crystalline orientation of KTaO3 and its superconducting transition temperature Tc is nearly one order of magnitude higher than that of the seminal LaAlO3/SrTiO3 interface. To understand its mechanism, it is crucial to address if the formation of oxide interfaces is indispensable for the presence of superconductivity. Here, by exploiting ionic liquid (IL) gating, we obtain superconductivity at KTaO3 (111) and (110) surfaces with Tc up to 2.0 K and 1.0 K, respectively. This oxide-interface-free superconductivity gives a clear experimental evidence that the essential physics of KTaO3 interface superconductivity lies in the KTaO3 surfaces doped with electrons. Moreover, the ability to control superconductivity at surfaces with IL provides a simple way to study the intrinsic superconductivity in KTaO3.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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