Superconducting Quantum Oscillations and Anomalous Negative Magnetoresistance in a Honeycomb Nanopatterned Oxide Interface Superconductor

IF 11.6 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical Review X Pub Date : 2025-01-14 DOI:10.1103/physrevx.15.011006

Yishuai Wang, Siyuan Hong, Wenze Pan, Yi Zhou, Yanwu Xie

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Abstract

The extremely low superfluid density and unprecedented tunability of oxide interface superconductors provide an ideal platform for studying fluctuations in two-dimensional superconductors. In this work, we fabricate an LaAlO3/KTaO3 interface superconductor patterned with a nanohoneycomb array of insulating islands. Little-Parks-like magnetoresistance oscillations are observed, which are dictated by the superconducting flux quantum h/2e. Moreover, an anomalous negative magnetoresistance (ANMR) appears under a weak magnetic field, suggesting magnetic-field-enhanced superconductivity. By examining their dependences on temperature, measurement current, and electrical gating, we conclude that both phenomena are associated with superconducting order parameter: The h/2e oscillations provide direct evidence of Cooper-pair transport, and the ANMR is interpreted as a consequence of multiple connected narrow superconducting paths with strong fluctuations.

Published by the American Physical Society

2025

查看原文本刊更多论文

蜂窝型纳米氧化物界面超导体中的超导量子振荡和异常负磁阻

氧化物界面超导体极低的超流密度和前所未有的可调性为研究二维超导体的波动提供了理想的平台。在这项工作中，我们制作了一个LaAlO3/KTaO3界面超导体，该超导体具有纳米蜂窝阵列的绝缘岛。观察到由超导通量量子h/2e决定的类利特尔帕克斯磁阻振荡。此外，在弱磁场下出现了反常的负磁阻（ANMR），表明磁场增强的超导性。通过检查它们对温度、测量电流和电门控的依赖性，我们得出结论，这两种现象都与超导序参量有关：h/2e振荡提供了库珀对输运的直接证据，并且ANMR被解释为具有强波动的多个连接的窄超导路径的结果。2025年由美国物理学会出版

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来源期刊

Physical Review X PHYSICS, MULTIDISCIPLINARY-

CiteScore

24.60

自引率

1.60%

发文量

197

审稿时长

3 months

期刊介绍： Physical Review X (PRX) stands as an exclusively online, fully open-access journal, emphasizing innovation, quality, and enduring impact in the scientific content it disseminates. Devoted to showcasing a curated selection of papers from pure, applied, and interdisciplinary physics, PRX aims to feature work with the potential to shape current and future research while leaving a lasting and profound impact in their respective fields. Encompassing the entire spectrum of physics subject areas, PRX places a special focus on groundbreaking interdisciplinary research with broad-reaching influence.