论文标题
外延生长的LAVO3/KTAO3（111）异质结构中的超导性
Superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures
论文作者
论文摘要
复杂的氧化物异插面可以容纳丰富的新兴现象，并且外延生长通常是形成这些界面的核心。最近，在KTAO3单晶底物和其他氧化物的膜之间发现了强烈的结晶方向依赖性二维超导性。出乎意料的是，这些氧化物膜中很少见。在这里，我们报告了外延生长的LAVO3/KTAO3（111）异质结构的超导性的存在，超导过渡温度为〜0.5 k。同时，在（001）和（110） - 式的lavo3/ktao3 heterostruction中未检测到（001） - （110））的超导性。此外，我们发现需要进行LAVO3/KTAO3（111）接口，需要氧气缺失的生长环境和最小LAVO3厚度〜0.8 nm（〜2个单位单元）。
Complex oxide heterointerfaces can host a rich of emergent phenomena, and epitaxial growth is usually at the heart of forming these interfaces. Recently, a strong crystalline-orientation-dependent two-dimensional superconductivity was discovered at interfaces between KTaO3 single-crystal substrates and films of other oxides. Unexpectedly, rare of these oxide films was epitaxially grown. Here, we report the existence of superconductivity in epitaxially grown LaVO3/KTaO3(111) heterostructures, with a superconducting transition temperature of ~0.5 K. Meanwhile, no superconductivity was detected in the (001)- and (110)-orientated LaVO3/KTaO3 heterostructures down to 50 mK. Moreover, we find that for the LaVO3/KTaO3(111) interfaces to be conducting, an oxygen-deficient growth environment and a minimum LaVO3 thickness of ~0.8 nm (~ 2 unit cells) are needed.
