论文标题
在KTAO $ _3 $（111）接口的二维各向异性超导性
Discovery of two-dimensional anisotropic superconductivity at KTaO$_3$ (111) interfaces
论文作者
论文摘要
在材料之间的界面上发现的独特电子结构可以使非常规量子状态出现。在这里，我们观察到在面向（111）的ktao $ _3 $之间形成的电子气体中的超导性，并使EUO或LAALO $ _3 $的绝缘叠加层进行绝缘。接近2.2 K的超导过渡温度比Laalo $ _3 $/srtio $ _3 $系统高约一个数量级。令人惊讶的是，（001）ktao $ _3 $接口处的类似电子气体保持正常为25 mk。临界场和电流 - 电压测量表明，超导性是二维的。较高的移动性EUO/KTAO $ _3 $（111）样品显示，在高温发作之前，在低温下运输特性的平面内各向异性很大，这表明像条纹一样出现，如相似的相位，其中超导性在一个方向上几乎是同质的，但在另一个方向上受到了强烈的调节。
The unique electronic structure found at interfaces between materials can allow unconventional quantum states to emerge. Here we observe superconductivity in electron gases formed at interfaces between (111) oriented KTaO$_3$ and insulating overlayers of either EuO or LaAlO$_3$. The superconducting transition temperature, approaching 2.2 K, is about one order of magnitude higher than that of the LaAlO$_3$/SrTiO$_3$ system. Strikingly, similar electron gases at (001) KTaO$_3$ interfaces remain normal down to 25 mK. The critical field and current-voltage measurements indicate that the superconductivity is two dimensional. Higher mobility EuO/KTaO$_3$ (111) samples show a large in-plane anisotropy in transport properties at low temperatures prior to onset of superconductivity, suggesting the emergence of a stripe like phase where the superconductivity is nearly homogeneous in one direction, but strongly modulated in the other.
