We report on the observation of a $T_c\sim 0.9\mathrm{K}$ superconductivity at the interface between ${\mathrm{LaAlO}}_3$ film and the $5d$ transition metal oxide ${\mathrm{KTaO}}_3(110)$ single crystal. The interface shows a large anisotropy of the upper critical field, and its superconducting transition is consistent with a Berezinskii-Kosterlitz-Thouless transition. Both facts suggest that the superconductivity is two-dimensional (2D) in nature. The carrier density measured at 5 K is $\sim 7\times {10}^{13}{\mathrm{cm}}^{-2}$. The superconducting layer thickness and coherence length are estimated to be $\sim 8$ and $\sim 30\mathrm{nm}$, respectively. Our result provides a new platform for the study of 2D superconductivity at oxide interfaces.

中文翻译：

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LaAlO3 / KTaO3（110）异质界面处的二维超导

我们报告关于 ${Ť}_C〜0.9\mathrm{ķ}$ 界面之间的超导性 ${\mathrm{拉铝}}_3$ 电影和 $5d$ 过渡金属氧化物 ${钾}_3（110）$单晶。该界面显示出较大的上临界场各向异性，其超导转变与Berezinskii-Kosterlitz-Thouless转变一致。这两个事实都表明，超导性本质上是二维的（2D）。在5 K下测得的载流子密度为$〜7\times {10}^{13}{\mathrm{厘米}}^{-2}$。超导层的厚度和相干长度估计为$〜8$ 和 $〜30\mathrm{纳米}$， 分别。我们的结果为研究氧化物界面的二维超导性提供了一个新的平台。