Charge-4e and charge-6e flux quantization and higher charge superconductivity in kagome superconductor ring devices

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 the charge-2e, two-electron Cooper pairs. Here we report evidence for multi-charge flux quantization in mesoscopic ring devices fabricated using the transition-metal kagome superconductor CsV3Sb5. We perform systematic magneto-transport 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 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 multi-charge 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.

References in corpus (31)

• Theory of Intertwined Orders in High Temperature Superconductors
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Roton pair density wave and unconventional strong-coupling superconductivity in a topological kagome metal
• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• Charge density waves and electronic properties of superconducting kagome metals
• Double superconducting dome and triple enhancement of Tc in the kagome superconductor CsV3Sb5 under high pressure
• Concurrence of anomalous Hall effect and charge density wave in a superconducting topological kagome metal
• The Physics of Pair Density Waves
• Three-dimensional charge density wave and robust zero-bias conductance peak inside the superconducting vortex core of a kagome superconductor CsV${}_3$Sb${}_5$
• Charge $4e$ superconductivity from pair density wave order in certain high temperature superconductors
• Dislocations and vortices in pair density wave superconductors
• Multiband superconductivity with sign-preserving order parameter in kagome superconductor CsV3Sb5
• Twofold symmetry of $c$-axis resistivity in topological kagome superconductor CsV${}_3$Sb${}_5$ with in-plane rotating magnetic field
• Intertwined vestigial order in quantum materials: nematicity and beyond
• s-wave superconductivity in kagome metal CsV${}_3$Sb${}_5$ revealed by ${}^{121/123}$Sb NQR and ${}^{51}$V NMR measurements
• Quantum liquid crystals in imbalanced Fermi gas: fluctuations and fractional vortices in Larkin-Ovchinnikov states
• Nodeless superconductivity in the kagome metal CsV${}_3$Sb${}_5$
• Chern Fermi pocket, topological pair density wave, and charge-4e and charge-6e superconductivity in kagome superconductors
• Microscopic evidence for anisotropic multigap superconductivity in the CsV${}_3$Sb${}_5$ kagome superconductor
• Phase transitions in a three dimensional $U(1)\times U(1)$ lattice London superconductor: Metallic superfluid and charge-4e superconducting states
• Charge-$4e$ superconductivity from multi-component nematic pairing: Application to twisted bilayer graphene
• h/e-Periodicity in Superconducting Loops
• Conventional and charge six superfluids from melting hexagonal Fulde-Ferrell-Larkin-Ovchinnikov phases in two dimensions
• Charge-$4e$ superconductivity from nematic superconductors in 2D and 3D
• Properties of mesoscopic superconducting thin-film rings. London approach
• Half-quantum vortex and d-soliton in Sr${}_2$RuO${}_4$
• Muon-spin relaxation study of the layered kagome superconductor CsV${}_3$Sb${}_5$
• Understanding resistance oscillation in CsV${}_3$Sb${}_5$ superconductor
• Integer and fractionalized vortex lattices and off-diagonal long-range order

Cited by in corpus (26)

• Kagome metals
• Chiral pair density waves with residual Fermi arcs in RbV3Sb5
• Phonon collapse and anharmonic melting of the 3D charge-density wave in kagome metals
• Self-consistent theory of $2\times 2$ pair density waves in kagome superconductors
• Charge-4$e$ Superconductivity in a Hubbard model
• Theory of charge-6e condensed phase in Kagome lattice superconductors
• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
• Probing Vortex Dynamics in 2D Superconductors with Scanning Quantum Microscope
• Electronic structure of $A$V${}_3$Sb${}_5$ kagome metals
• Phase coherence of charge-$6e$ superconductors via a frustrated Kagome XY antiferromagnet
• Thermomodulated intrinsic Josephson effect in Kagome CsV3Sb5
• Imaging half-unit-cell Cooper-pair density waves in monolayer 1T${}^{\prime }$-MoTe${}_2$
• Topological Bardeen-Cooper-Schrieffer theory of superconducting quantum rings
• Vestigial $d$-wave charge-$4e$ Superconductivity from Bidirectional Pair Density Waves
• Switchable chiral 2x2 pair density wave in pure CsV3Sb5
• Magnetoresistance hysteresis in the superconduting state of Kagome CsV${}_3$Sb${}_5$
• Strong pair-density-wave fluctuations in an exactly solvable doped Mott insulator
• Evolution of charge correlations in the hole-doped kagome superconductor CsV${}_{3-x}$Ti${}_x$Sb${}_5$
• Recent progress in quantum spin liquids, fractional magnetization plateaus, and unconventional superconductivity in kagome lattices
• Addressing the Infinite Variance Problem in Fermionic Monte Carlo Simulations: Retrospective Error Remediation and the Exact Bridge Link Method
• Superconducting gap and its Little-Parks like oscillations with high-order harmonics in lithium intercalated 1T-TiSe${}_2$
• Pair-density-wave phase of strongly interacting electrons on the triangular lattice: A variational Monte Carlo study
• Revisiting vestigial order in nematic superconductors: gauge-field mechanisms and model constraints
• Inter-Layer Correlation of Loop Current Charge Density Wave on the Bilayer Kagomé Lattice
• Fate of Berezinskii-Kosterlitz-Thouless Paired Phase in Coupled $XY$ Models
• Enhanced Coupling of Superconductivity and Evolution of Gap Structure in CsV3Sb5 through Ta Doping