超导铌纳米薄膜中的衬底诱导邻近效应
Substrate induced proximity effect in superconducting niobium nanofilms
摘要：
研究了氧化硅和蓝宝石衬底上不同厚度的高质量铌纳米薄膜的结构和超导特性。不同的基板和Nb膜的超导性能所发挥的作用进行了讨论的基础上的缺陷的膜和Nb膜和基板之间的界面氧化层的存在下。用X射线吸收光谱分析了界面层的结构。我们发现，这个界面层导致一个强大的邻近效应，特别是在SiO $_2$衬底上沉积的薄膜，改变Nb膜的超导性能。我们的研究结果表明，临界温度是由量子尺寸效应之间的相互作用，由于Nb膜厚度的减少，和邻近效应。
英文摘要：
Structural and superconducting properties of high quality Niobium nanofilms with different thicknesses are investigated on silicon oxide and sapphire substrates. The role played by the different substrates and the superconducting properties of the Nb films are discussed based on the defectivity of the films and on the presence of an interfacial oxide layer between the Nb film and the substrate. The X-ray absorption spectroscopy is employed to uncover the structure of the interfacial layer. We show that this interfacial layer leads to a strong proximity effect, specially in films deposited on a SiO$_2$ substrate, altering the superconducting properties of the Nb films. Our results establish that the critical temperature is determined by an interplay between quantum-size effects, due to the reduction of the Nb film thicknesses, and proximity effects.
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