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

Ge, Jun; Wang, Pinyuan; Xing, Ying; Yin, Qiangwei; Wang, Anqi; Shen, Jie; Lei, Hechang; Wang, Ziqiang; Wang, Jian

doi:10.1103/PhysRevX.14.021025

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

Journal Article · 13 May 2024 · Physical Review. X

DOI: https://doi.org/10.1103/PhysRevX.14.021025 · OSTI ID:2349536

Ge, Jun; Wang, Pinyuan; Xing, Ying; Yin, Qiangwei;

;

; Lei, Hechang;

;

The flux quantization is a key indication of electron pairing in superconductors. For example, the well-known $h / 2 e$ flux quantization is considered strong evidence for the existence of charge- $2 e$ , two-electron Cooper pairs. Here we report evidence for multicharge flux quantization in mesoscopic ring devices fabricated using the transition-metal kagome superconductor ${CsV}_{3} {Sb}_{5}$ . We perform systematic magnetotransport measurements and observe unprecedented quantization of magnetic flux in units of $h / 4 e$ and $h / 6 e$ in magnetoresistance oscillations. Specifically, at low temperatures, magnetoresistance oscillations with period $h / 2 e$ are detected, as expected from the flux quantization for charge- $2 e$ superconductivity. We find that the $h / 2 e$ oscillations are suppressed and replaced by resistance oscillations with $h / 4 e$ periodicity when the temperature is increased. Increasing the temperature further suppresses the $h / 4 e$ oscillations, and robust resistance oscillations with $h / 6 e$ periodicity emerge as evidence for charge- $6 e$ 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- $2 e$ Cooper pair condensate, revealing new insights into the intertwined and vestigial electronic order in kagome superconductors. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-99ER45747

OSTI ID:: 2349536

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Journal Issue: 2 Vol. 14; ISSN PRXHAE; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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