金基超导体AuSn4中rashba -表面带依赖Yu-Shiba-Rusinov态的观察

IF 9.1 1区材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Nano Letters Pub Date : 2025-03-24 DOI:10.1021/acs.nanolett.5c00523

Zichen Huang, Hui Chen, Rui Song, Hui Guo, Hao Zhang, Guoyu Xian, Senhao Lv, Guangyuan Han, Ruisong Ma, Geng Li, Chengmin Shen, Haitao Yang, Qing Huan, Hong-Jun Gao

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引用次数: 0

摘要

金基超导体中Rashba效应、超导性和磁性之间的相互作用为探索拓扑超导性提供了一个平台，但Rashba带与超导束缚态之间的相互作用仍未被探索。本文利用超低温（5 mK）扫描隧道显微镜/光谱学研究了AuSn4表面Fe原子周围的rashba -表面带依赖Yu-Shiba-Rusinov （YSR）态。在具有Rashba带的端Au表面上，大多数铁原子占据Au空位，而在具有主体金属态的端sn表面上只有少数铁原子吸附。值得注意的是，在sn端表面上可以观察到定位在Fe原子上的YSR态，而在au端表面上则没有。第一性原理计算揭示了Sn表面上铁原子的显著磁矩，而Au表面上的磁矩几乎可以忽略不计，这阐明了观察到的表面依赖的YSR态。终端依赖的局部力矩来自Rashba表面带和s-d耦合的相互作用，如Anderson s-d交换模型所描述的那样。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

Observation of Rashba-Surface-Band-Dependent Yu–Shiba–Rusinov States in a Gold-Based Superconductor AuSn4

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Observation of Rashba-Surface-Band-Dependent Yu–Shiba–Rusinov States in a Gold-Based Superconductor AuSn4

The interplay between the Rashba effect, superconductivity, and magnetism in gold-based superconductors provides a platform for exploring topological superconductivity, yet the interaction between Rashba bands and superconducting bound states remains unexplored. Here, we report Rashba-surface-band-dependent Yu–Shiba–Rusinov (YSR) states around Fe adatoms on the surfaces of AuSn₄, using ultralow temperature (5 mK) scanning tunneling microscope/spectroscopy. On Au-terminated surfaces with Rashba bands, most Fe atoms occupy Au vacancies, while only a few adsorb on the Sn-terminated surfaces with dominant bulk metallic states. Remarkably, YSR states localized on the Fe atom are observed on Sn-terminated surfaces but absent on Au-terminated surfaces. First-principle calculations reveal a significant magnetic moment for Fe adatoms on Sn surfaces compared to a nearly negligible value on Au surfaces, which elucidates the observed surface-dependent YSR states. The termination-dependence local moment arises from the interplay of Rashba surface bands and s-d coupling, as described by the Anderson s-d exchange model.

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来源期刊

Nano Letters 工程技术-材料科学：综合

CiteScore

16.80

自引率

2.80%

发文量

1182

审稿时长

1.4 months

期刊介绍： Nano Letters serves as a dynamic platform for promptly disseminating original results in fundamental, applied, and emerging research across all facets of nanoscience and nanotechnology. A pivotal criterion for inclusion within Nano Letters is the convergence of at least two different areas or disciplines, ensuring a rich interdisciplinary scope. The journal is dedicated to fostering exploration in diverse areas, including: - Experimental and theoretical findings on physical, chemical, and biological phenomena at the nanoscale - Synthesis, characterization, and processing of organic, inorganic, polymer, and hybrid nanomaterials through physical, chemical, and biological methodologies - Modeling and simulation of synthetic, assembly, and interaction processes - Realization of integrated nanostructures and nano-engineered devices exhibiting advanced performance - Applications of nanoscale materials in living and environmental systems Nano Letters is committed to advancing and showcasing groundbreaking research that intersects various domains, fostering innovation and collaboration in the ever-evolving field of nanoscience and nanotechnology.