Charge-4e and Charge-6e Flux Quantization and Higher Charge Superconductivity in Kagome Superconductor Ring Devices

IF 11.6 1区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY Physical Review X Pub Date : 2024-05-13 DOI:10.1103/physrevx.14.021025
Jun Ge, Pinyuan Wang, Ying Xing, Qiangwei Yin, Anqi Wang, Jie Shen, Hechang Lei, Ziqiang Wang, Jian Wang
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Abstract

The flux quantization is a key indication of electron pairing in superconductors. For example, the well-known h/2e flux quantization is considered strong evidence for the existence of charge-2e, two-electron Cooper pairs. Here we report evidence for multicharge flux quantization in mesoscopic ring devices fabricated using the transition-metal kagome superconductor CsV3Sb5. We perform systematic magnetotransport measurements and observe unprecedented quantization of magnetic flux in units of h/4e and h/6e in magnetoresistance oscillations. Specifically, at low temperatures, magnetoresistance oscillations with period h/2e are detected, as expected from the flux quantization for charge-2e superconductivity. We find that the h/2e oscillations are suppressed and replaced by resistance oscillations with h/4e periodicity when the temperature is increased. Increasing the temperature further suppresses the h/4e oscillations, and robust resistance oscillations with h/6e periodicity emerge as evidence for charge-6e flux quantization. Our observations provide the first experimental evidence for the existence of multicharge flux quanta and emergent quantum matter exhibiting higher-charge superconductivity in the strongly fluctuating region above the charge-2e Cooper pair condensate, revealing new insights into the intertwined and vestigial electronic order in kagome superconductors.

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卡戈米超导体环形器件中的电荷-4e 和电荷-6e 通量量化与高电荷超导性
磁通量化是超导体中电子配对的一个关键指标。例如,众所周知的 h/2e 磁通量化被认为是电荷-2e、双电子库珀对存在的有力证据。在这里,我们报告了使用过渡金属卡戈米超导体 CsV3Sb5 制造的介观环形器件中存在多电荷磁通量化的证据。我们进行了系统的磁传输测量,并在磁阻振荡中观察到以 h/4e 和 h/6e 为单位的前所未有的磁通量子化。具体来说,在低温条件下,我们检测到了周期为 h/2e 的磁阻振荡,这是电荷-2e 超导的磁通量化所预期的。我们发现,当温度升高时,h/2e 振荡被抑制,取而代之的是周期为 h/4e 的电阻振荡。温度升高会进一步抑制 h/4e 振荡,并出现具有 h/6e 周期性的强电阻振荡,这是电荷-6e 通量量子化的证据。我们的观测首次提供了实验证据,证明在电荷-2e 库珀对凝聚体上方的强波动区域存在多电荷通量量子和表现出较高电荷超导性的新兴量子物质,揭示了神户超导体中交织和残留电子秩序的新见解。
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来源期刊
Physical Review X
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.
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