Identification of spin-triplet superconductivity through a helical-chiral phase transition in Sr2RuO4 thin films
Identification of spin-triplet superconductivity through a helical-chiral phase transition in Sr2RuO4 thin films
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DOI：
10.1103/physrevb.101.220501
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发表时间：
2020-06-01
影响因子：
3.7
通讯作者：
Manske, D.
中科院分区：
文献类型：
--
作者：
Ikegaya, S.;Yada, K.;Manske, D.
尽管在过去的二十年里做了很多努力，Sr2RuO4超导体的配对对称性仍然不清楚。由于近年来Sr2RuO4薄膜制备技术的快速发展，我们提出了一种有前途的策略，通过利用由外磁场引起的反对称自旋轨道耦合势和塞曼势来识别薄膜几何结构中的自旋三重态超导性。我们证明了通过增加外加磁场，自旋三重态超导薄膜经历了从螺旋态到手性态的相变。这种相变伴随着表面安德烈夫束缚态性质的剧烈变化。因此，螺旋-手性相变，这是自旋三重态超导体所特有的，可以通过正常金属/超导体结隧穿电导谱的突然变化来检测。重要的是，我们的建议是通过结合有关自旋三重态超导物理的基本和刚性概念构建的。
Despite much effort over the past two decades, the pairing symmetry of a Sr2RuO4 superconductor is still unclear. Motivated by the recent rapid progress in fabrication techniques for Sr2RuO4 thin films, we propose a promising strategy for identifying the spin-triplet superconductivity in the thin-film geometry by employing an antisymmetric spin-orbit-coupling potential and a Zeeman potential due to an external magnetic field. We demonstrate that a spin-triplet superconducting thin film undergoes a phase transition from a helical state to a chiral state by increasing the applied magnetic field. This phase transition is accompanied by a drastic change in the property of surface Andreev bound states. As a consequence, the helical-chiral phase transition, which is unique to the spin-triplet superconductors, can be detected through a sudden change in a tunneling conductance spectrum of a normal-metal/superconductor junction. Importantly, our proposal is constructed by combining fundamental and rigid concepts regarding the physics of spin-triplet superconductivity.