Superconductors that possess both broken spatial inversion symmetry and spin-orbit interactions exhibit a mix of spin singlet and triplet pairing. Here, we report on measurements of the superconducting properties of electron-doped, strained $\mathrm{SrTi}{\mathrm{O}}_3$ films. These films have an enhanced superconducting transition temperature and were previously shown to undergo a transition to a polar phase prior to becoming superconducting. We show that some films show signatures of an unusual superconducting state, such as an in-plane critical field that is higher than both the paramagnetic and orbital pair breaking limits. Moreover, nonreciprocal transport, which reflects the ratio of odd versus even pairing interactions, is observed. Together, these characteristics indicate that these films provide a tunable platform for investigations of unconventional superconductivity.

中文翻译：

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掺杂极性SrTiO3薄膜中奇偶混合超导的可能特征

同时具有破碎的空间反转对称性和自旋轨道相互作用的超导体表现出自旋单重态和三重态对的混合。在这里，我们报告了电子掺杂，应变的超导特性的测量结果$\mathrm{锶钛}{\mathrm{Ø}}_3$电影。这些膜具有增强的超导转变温度，并且先前被证明在变为超导之前经历了向极性相的转变。我们发现，有些电影表现出异常超导状态的特征，例如面内临界场高于顺磁性和轨道对断裂极限。此外，观察到不可逆传输，其反映了奇偶配对相互作用的比率。这些特征共同表明，这些薄膜为研究非常规超导性提供了可调平台。