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The flux quantization is a key indication of electron pairing insuperconductors. For example, the well-known h/2e flux quantization isconsidered strong evidence for the existence of the charge-2e, two-electronCooper pairs. Here we report evidence for multi-charge flux quantization inmesoscopic ring devices fabricated using the transition-metal kagomesuperconductor CsV3Sb5. We perform systematic magneto-transport measurementsand observe unprecedented quantization of magnetic flux in units of h/4e andh/6e in magnetoresistance oscillations. Specifically, at low temperatures,magnetoresistance oscillations with period h/2e are detected, as expected fromthe flux quantization for charge-2e superconductivity. We find that the h/2eoscillations are suppressed and replaced by resistance oscillations with h/4eperiodicity when temperature is increased. Increasing the temperature furthersuppresses the h/4e oscillations and robust resistance oscillations with h/6eperiodicity emerge as evidence for charge-6e flux quantization. Ourobservations provide the first experimental evidence for the existence ofmulti-charge flux quanta and emergent quantum matter exhibiting higher-chargesuperconductivity in the strongly fluctuating region above the charge-2e Cooperpair condensate, revealing new insights into the intertwined and vestigialelectronic order in kagome superconductors.

Evidence for multi-charge flux quantization in kagome superconductor ring devices