Atomic-scale frustrated Josephson coupling and multicondensate visualization in FeSe

IF 37.2 1区 材料科学 Q1 CHEMISTRY, PHYSICAL
Nileema Sharma, Matthew Toole, James McKenzie, Sheng Ran, Xiaolong Liu
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引用次数: 0

Abstract

In a Josephson junction involving multiband superconductors, competition between interband and interjunction Josephson couplings gives rise to frustration and spatial disjunction of superfluid densities among superconducting condensates1,2,3,4,5,6,7. Such frustrated coupling manifests as the quantum interference of Josephson currents from different tunnelling channels and becomes tunable if channel transparency can be varied5,6,7,8. To explore these unconventional effects in the prototypical s±-wave superconductor FeSe (ref. 9), we use atomic-resolution scanned Josephson tunnelling microscopy10,11,12,13 for condensate-resolved imaging and junction tuning—capabilities unattainable in macroscopic Josephson devices with fixed characteristics. We quantitatively demonstrate frustrated Josephson tunnelling by examining two tunnelling inequalities. The relative transparency of two parallel tunnelling pathways is found tunable, revealing a tendency towards a 0–π transition with decreasing scanned Josephson tunnelling microscopy junction resistance. The simultaneous visualization of both superconducting condensates reveals anticorrelated superfluid modulations, highlighting the role of interband scattering. Our study establishes scanned Josephson tunnelling microscopy as a powerful tool enabling new research frontiers of multicondensate superconductivity.

Abstract Image

FeSe中原子尺度受挫Josephson耦合和多凝聚可视化
在涉及多带超导体的约瑟夫森结中,带间和结间约瑟夫森耦合之间的竞争导致超导凝聚体之间的超流体密度的挫败和空间分离1,2,3,4,5,6,7。这种受挫的耦合表现为来自不同隧道通道的约瑟夫森电流的量子干涉,如果通道透明度可以改变5,6,7,8,则可调谐。为了在典型的s±波超导体FeSe(参考文献9)中探索这些非常规效应,我们使用原子分辨率扫描约瑟夫森隧道显微镜10,11,12,13,以获得具有固定特性的宏观约瑟夫森器件无法实现的凝聚分辨率成像和结调谐能力。我们定量地证明受挫约瑟夫森隧道通过检查两个隧道不等式。发现两个平行隧道通道的相对透明度是可调的,随着扫描约瑟夫森隧道显微镜结电阻的降低,显示出向0 -π转变的趋势。两种超导凝聚体的同时可视化显示了反相关的超流体调制,突出了带间散射的作用。我们的研究建立了扫描约瑟夫森隧道显微镜作为一个强大的工具,开辟了多凝聚超导的新研究领域。
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来源期刊
Nature Materials
Nature Materials 工程技术-材料科学:综合
CiteScore
62.20
自引率
0.70%
发文量
221
审稿时长
3.2 months
期刊介绍: Nature Materials is a monthly multi-disciplinary journal aimed at bringing together cutting-edge research across the entire spectrum of materials science and engineering. It covers all applied and fundamental aspects of the synthesis/processing, structure/composition, properties, and performance of materials. The journal recognizes that materials research has an increasing impact on classical disciplines such as physics, chemistry, and biology. Additionally, Nature Materials provides a forum for the development of a common identity among materials scientists and encourages interdisciplinary collaboration. It takes an integrated and balanced approach to all areas of materials research, fostering the exchange of ideas between scientists involved in different disciplines. Nature Materials is an invaluable resource for scientists in academia and industry who are active in discovering and developing materials and materials-related concepts. It offers engaging and informative papers of exceptional significance and quality, with the aim of influencing the development of society in the future.
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