Bi-Ni体系中的超导性与磁性：从块体到异质结构

中文摘要 AI 辅助

具有磁性组分的非常规超导电性（如时间反演对称性破缺、三重态配对及邻近效应）长期以来是物理学与材料科学领域的研究热点，可作为催生创新现象与效应、推动科学进步及技术发展的新来源。Bi-Ni体系已成为研究这类现象学的便捷候选体系。严格来说，Bi-Ni体系包含两类不同的研究对象：第一类是NiBi₃金属间化合物，它是临界温度为4K的超导体，正常相中的复杂磁性似乎主导着电学性质，但与超导性质无关；第二类并非单一材料，而是由Bi和Ni构成的双层异质结构，其超导相展现出时间反演对称性破缺与三重态配对的有力证据，呈现出复杂的非常规超导态。与铀基化合物等其他非常规超导候选体系相比，该体系样品制备简便，加速了相关研究进展。本文详细综述了这两类体系电子性质的主要研究成果，并讨论了为完全理解该主题需解决的主要开放问题。

英文摘要

Unconventional superconductivity with ingredients of magnetism such as time reversal breaking, triplet pairing and proximity effects has been a long time pursued topic in physics and material science as a new source of innovative phenomena and effects to drive further scientific advances and technologies. The Bi-Ni system has emerged as a convenient candidate for the investigation of such phenomenology. Strictly speaking, the term Bi-Ni system refers to two different schemes, first to the NiBi$_{3}$ intermetallic compound, a 4 K superconductor in which a complex magnetism seems to govern electrical properties in the normal phase, but without implication in the superconducting properties. The second Bi-Ni system is not quite a material but a heterostructure formed by a bilayer of Bi and Ni. Here the superconducting phase has to steal the spotlight by showing strong evidence of time-reversal breaking and triplet pairing featuring a complex unconventional state. The ease of preparing the samples, compared to other candidates for such unconventionality, usually Uranium-based compounds, has accelerated the research in this system. Here, we went through a detailed review of the main results about the electronic properties of these two systems as well as a discussion of the main open questions to be solved in order to reach the complete understanding in this topic.

发表机构

• Leiden University（莱顿大学）
• Universidade Federal do Rio Grande do Sul（南里奥格兰德联邦大学）
• Universidade Federal Fluminense（弗鲁米嫩塞联邦大学）

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