Spin texture and spin-orbit coupling contributions in spin-triplet superconductivity,Physical Review B

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Spin texture and spin-orbit coupling contributions in spin-triplet superconductivity
Physical Review B ( IF 3.2 ) Pub Date : 2024-09-10 , DOI: 10.1103/physrevb.110.094504
Pablo Tuero ₁ , César González-Ruano _{1,

2} , Yuan Lu _{3,

4} , Coriolan Tiusan _{3,

4,

5} , Farkhad G. Aliev ₁

Affiliation

Over the past decade, it has been proposed theoretically and confirmed experimentally that long-range spin-triplet (LRT) superconductivity can be generated in superconductor/ferromagnet hybrids either by the presence of spin textures (ST-LRT) or owing to spin-orbit coupling (SOC-LRT). Nevertheless, there has been no theoretical or experimental investigation to date suggesting that both contributions could simultaneously exist within an experimental system. To disentangle these contributions, we present a comprehensive study of superconducting quasiparticle interference effects taking place inside a ferromagnetic layer interfacing a superconductor, through the investigation of above-gap conductance anomalies (CAs) related to MacMillan-Rowell resonances. The bias dependence of the CAs has been studied under a wide range of in-plane (IP) and out-of-plane (OOP) magnetic fields in two types of epitaxial, V/MgO/Fe-based ferromagnet-superconductor junctions with interfacial spin-orbit coupling. We observe an anisotropy of the CA amplitude under small IP and OOP magnetic fields while remaining weakly affected by high fields, and implement micromagnetic simulations to help us distinguish between the ST-LRT and SOC-LRT contributions. Our findings suggest that further exploration of Fabry-Pérot-type interference effects in electron transport could yield valuable insights into the hybridization between superconductors and ferromagnets induced by spin-orbit coupling and spin textures.

中文翻译：

自旋织构和自旋轨道耦合对自旋三重态超导的贡献

在过去的十年中，人们从理论上提出并通过实验证实，通过自旋纹理（ST-LRT）或自旋轨道的存在，可以在超导体/铁磁体混合体中产生长程自旋三重态（LRT）超导性耦合（SOC-LRT）。然而，迄今为止还没有理论或实验研究表明这两种贡献可以同时存在于实验系统中。为了理清这些贡献，我们通过研究与麦克米伦-罗威尔共振相关的带隙上方电导异常（CA），对与超导体接口的铁磁层内部发生的超导准粒子干涉效应进行了全面研究。已经在两种类型的外延 V/MgO/Fe 基铁磁体-超导体结（具有界面界面）中的各种面内 (IP) 和面外 (OOP) 磁场下研究了 CA 的偏置依赖性。自旋轨道耦合。我们观察到小 IP 和 OOP 磁场下 CA 振幅的各向异性，同时仍受高场的微弱影响，并实施微磁模拟以帮助我们区分 ST-LRT 和 SOC-LRT 的贡献。我们的研究结果表明，进一步探索电子传输中的法布里-珀罗型干涉效应可以为自旋轨道耦合和自旋纹理引起的超导体和铁磁体之间的杂化提供有价值的见解。

更新日期：2024-09-10

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