Coupling different superconducting states at oxide interfaces

绝大多数已知的超导体是自旋单线态，这意味着库珀电子对具有反平行自旋。只有少数已知的化合物显示出固有的（p波）三重态超导性（最值得注意的是Sr2RuO4（SRO），这是这项博士研究的关键）。SRO中的三重态配对是偶数频率的，并且在概念上不同于通过邻近效应在铁磁体中诱导的奇数频率三重态配对到常规（s波）超导体。然而，有理论预测，替代配对状态可以诱导表面，提高了前景之间的耦合不同的超导订单通过工程邻近效应。本博士的目的是研究这种耦合，并将其应用于创建薄膜和器件结构的SRO这是以前不可行的。

The vast majority of known superconductors are spin singlet meaning the Cooper pairs of electrons have antiparallel spins. There are only a few known compounds which show intrinsic (p-wave) triplet superconductivity (most notably Sr2RuO4 (SRO) which is key to this PhD research). The triplet pairing in SRO is even frequency and is conceptually different to the odd-frequency triplet pairing induced in ferromagnets via proximity effect to conventional (s-wave) superconductors. However, there are theoretical predictions that alternative pairing states can be induced at surfaces which raise the prospect of coupling between different superconducting orders via engineered proximity effects. The aim of this PhD is to investigate this coupling and apply it to create thin films and device structures of SRO which have not previously been feasible.