Microscopic evidence for anisotropic multigap superconductivity in the CsV${}_3$Sb${}_5$ kagome superconductor

Abstract

The recently discovered kagome superconductor CsV${}_3$Sb${}_5$ ($T_c\simeq 2.5$ K) has been found to host charge order as well as a non-trivial band topology, encompassing multiple Dirac points and probable surface states. Such a complex and phenomenologically rich system is, therefore, an ideal playground for observing unusual electronic phases. Here, we report on microscopic studies of its anisotropic superconducting properties by means of transverse-field muon spin rotation ($\mu$SR) experiments. The temperature dependences of the in-plane and out-of-plane components of the magnetic penetration depth ${\lambda }_{ab}^{-2}(T)$ and ${\lambda }_c^{-2}(T)$ indicate that the superconducting order parameter exhibits a two-gap ($s+s$)-wave symmetry, reflecting the multiple Fermi surfaces of CsV3Sb5. The multiband nature of its superconductivity is further validated by the different temperature dependences of the anisotropic magnetic penetration depth ${\gamma }_{\lambda }(T)$ and upper critical field ${\gamma }_{{\mathrm{B}}_{c2}}(T)$, both in close analogy with the well known two-gap superconductor MgB${}_2$. Remarkably, the high value of the $T_c/{\lambda }^{-2}(0)$ ratio in both field orientations strongly suggests the unconventional nature of superconductivity. The relaxation rates obtained from zero field $\mu$SR experiments do not show noticeable change across the superconducting transition, indicating that superconductivity does not break time reversal symmetry.

arXiv comment9 pages, 4 figures

References in corpus (53)

• Correlated Insulator Behaviour at Half-Filling in Magic Angle Graphene Superlattices
• Time-Reversal Symmetry Breaking Superconductivity in Sr2RuO4
• CsV${}_3$Sb${}_5$: a ${\mathbb{Z}}_2$ topological kagome metal with a superconducting ground state
• Massive Dirac fermions in a ferromagnetic kagome metal
• Discovery of unconventional chiral charge order in kagome superconductor KV3Sb5
• Cascade of correlated electron states in a kagome superconductor CsV3Sb5
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• musrfit: A free platform-independent framework for muSR data analysis
• Superconductivity in the ${\mathbb{Z}}_2$ kagome metal KV${}_3$Sb${}_5$
• Negative flat band magnetism in a spin-orbit coupled correlated kagome magnet
• 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
• Superconductivity and normal-state properties of kagome metal RbV3Sb5 single crystals
• Properties of the Ideal Ginzburg-Landau Vortex Lattice
• Evidence for time-reversal symmetry breaking in the non-centrosymmetric superconductor LaNiC${}_2$
• Observation of Unconventional Charge Density Wave without Acoustic Phonon Anomaly in Kagome Superconductors AV3Sb5 (A=Rb,Cs)
• Analysis of Charge Order in the Kagome Metal $A$V${}_3$Sb${}_5$ ($A=$K,Rb,Cs)
• Temperature and field dependence of the anisotropy of MgB2
• Sublattice Interference in the Kagome Hubbard Model
• Nature of unconventional pairing in the kagome superconductors AV${}_3$Sb${}_5$
• Multiband superconductivity with sign-preserving order parameter in kagome superconductor CsV3Sb5
• Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5
• Pressure-induced Reemergence of Superconductivity in Topological Kagome Metal CsV3Sb5
• Intrinsic nature of chiral charge order in the kagome superconductor RbV3Sb5
• s-wave superconductivity in kagome metal CsV${}_3$Sb${}_5$ revealed by ${}^{121/123}$Sb NQR and ${}^{51}$V NMR measurements
• Anisotropy of the Optimally-Doped Iron Pnictide Superconductor Ba(Fe0.926Co0.074)2As2
• Nodeless superconductivity in the kagome metal CsV${}_3$Sb${}_5$
• Split superconducting and time-reversal symmetry-breaking transitions, and magnetic order in Sr${}_2$RuO${}_4$ under uniaxial stress
• Highly-robust reentrant superconductivity in CsV3Sb5 under pressure
• Tunable Berry Curvature Through Magnetic Phase Competition in a Topological Kagome Magnet
• Possible topologically non-trivial superconducting order parameter in type-II Weyl semimetal T_d-MoTe_2
• Effect of the vortex core on the magnetic field in hard superconductors
• Anisotropic superconducting properties of Kagome metal CsV3Sb5
• Anisotropic superconducting properties of single-crystalline FeSe0.5Te0.5
• Quantum transport evidence of topological band structures of kagome superconductor CsV3Sb5
• Temperature dependent anisotropy of the penetration depth and coherence length in MgB$_2
• Two-gap superconductivity in Ba_1-xK_xFe_2As_2: A complementary study of the magnetic penetration depth by \muSR and ARPES
• Emerging superconductivity with broken time reversal symmetry inside a superconducting $s$-wave state
• Superconductivity, pseudogap, and phase separation in topological flat bands: a quantum Monte Carlo study
• Nodal superconductivity and superconducting domes in the topological Kagome metal CsV3Sb5
• Unsplit superconducting and time reversal symmetry breaking transitions in Sr${}_2$RuO${}_4$ under hydrostatic pressure and disorder
• Anisotropic London Penetration Depth and Superfluid Density in Single Crystals of Iron-based Pnictide Superconductors
• Evidence for two distinct anisotropies in the oxypnictide superconductors SmFeAsO_(0.8)F_(0.2) and NdFeAsO_(0.8)F_(0.2)
• Flat band superconductivity in the square-octagon lattice
• Evidence for a Two-stage Melting Transition of the Vortex Matter in Bi2Sr2Ca1Cu2O8+d Single Crystals obtained by Muon Spin Rotation
• Evidence for competition between the superconducting and the pseudogap state in (BiPb)_2(SrLa)_2CuO_{6+δ} from muon-spin rotation experiments
• The single- vs. two-gap scenario: the specific heat and the thermodynamic critical field of BeAu superconductor
• Time-reversal symmetry breaking in Re-based superconductors: Recent developments
• Anisotropy induced vortex lattice rearrangement in CaKFe${}_4$As${}_4$
• Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5
• Orbital ordering and fluctuations in a kagome superconductor CsV3Sb5
• Superconducting gap symmetry of the noncentrosymmetric superconductor W3Al2C
• Self-consistent two-gap approach in studying multi-band superconductivity in NdFeAsO${}_{0.65}$F${}_{0.35}$

Cited by in corpus (61)

• Topological kagome magnets and superconductors
• Time-reversal symmetry-breaking charge order in a kagome superconductor
• Kagome superconductors AV${}_3$Sb${}_5$ (A=K, Rb, Cs)
• Quantum states and intertwining phases in kagome materials
• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Tunable nodal kagome superconductivity in charge ordered RbV3Sb5
• Nodeless electron pairing in CsV${}_3$Sb${}_5$-derived kagome superconductors
• Charge order breaks time-reversal symmetry in CsV${}_3$Sb${}_5$
• Mechanism of exotic density-wave and beyond-Migdal unconventional superconductivity in kagome metal AV3Sb5 (A=K, Rb, Cs)
• Bulk evidence of anisotropic $s$-wave pairing with no sign change in the kagome superconductor CsV${}_3$Sb${}_5$
• Chiral excitonic order from twofold van Hove singularities in kagome metals
• Nodeless superconductivity in kagome metal CsV${}_3$Sb${}_5$ with and without time reversal symmetry breaking
• Superconductivity from repulsive interactions on the kagome lattice
• Charge-4e and charge-6e flux quantization and higher charge superconductivity in kagome superconductor ring devices
• Emergent nematicity and intrinsic vs. extrinsic electronic scattering processes in the kagome metal CsV${}_3$Sb${}_5$
• Dynamical Study of the Origin of the Charge Density Wave in $A$V${}_3$Sb${}_5$ ($A=$K, Rb, Cs) Compounds
• Muon-spin relaxation study of the layered kagome superconductor CsV${}_3$Sb${}_5$
• Unconventional superconductivity protected from disorder on the kagome lattice
• Electronic Landscape of Kagome Superconductors $\text{A}$V${}_3$Sb${}_5$ ($\text{A}$ = K, Rb, Cs) from Angle-Resolved Photoemission Spectroscopy
• Dirac lines and loop at the Fermi level in the Time-Reversal Symmetry Breaking Superconductor LaNiGa${}_2$
• Superconductivity from Orbital-Selective Electron-Phonon Coupling in $A{\mathrm{V}}_3{\mathrm{Sb}}_5$
• Unconventional gapping behavior in a kagome superconductor
• Strong-coupling superconductivity and weak vortex pinning in Ta-doped CsV${}_3$Sb${}_5$ single crystals
• Kagome metals
• Evidence of a distinct collective mode in Kagome superconductors
• Similarities and Differences in the Fermiology of Kagome Metals AV${}_3$Sb${}_5$ (A=K, Rb, Cs) Revealed by Shubnikov-de Haas Oscillations
• Local spectroscopic evidence for a nodeless magnetic kagome superconductor CeRu${}_2$
• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
• Non-degenerate surface pair density wave in the Kagome superconductor CsV${}_3$Sb${}_5$ -- application to vestigial orders
• Two elementary band representation model, Fermi surface nesting, and surface topological superconductivity in $A$V${}_3$Sb${}_5$ ($A=\text{K, Rb, Cs}$)
• Tunability of charge density wave in a magnetic kagome metal
• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Superconductivity and a van Hove singularity confined to the surface of a topological semimetal
• Probing the pairing symmetry in kagome superconductors based on the single-particle spectrum
• Observation of Anomalous Thermal Hall Effect in a Kagome Superconductor
• Intriguing kagome topological materials
• Conventional Superconductivity in the Doped Kagome Superconductor Cs(V0.86Ta0.14)3Sb5 from Vortex Lattice Studies
• Fully-gapped superconductivity with rotational symmetry breaking in pressurized kagome metal CsV${}_3$Sb${}_5$
• Observation of Fermi-surface-dependent anisotropic Cooper pairing in kagome superconductor CsV3Sb5
• Tuning electronic pairing by uniaxial strain in kagome lattices
• Microscopic study of the impurity effect in the kagome superconductor La(Ru${}_{1-x}$Fe${}_x$)${}_3$Si${}_2$
• Lattice dynamics study of electron-correlation-induced charge density wave in antiferromagnetic kagome metal FeGe
• Photoemission Insights to Electronic Orders in Kagome Superconductor AV3Sb5
• Quantum Phase Transition as a Promising Route to Enhance the Critical Current in Kagome Superconductor CsV${}_3$Sb${}_5$
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Type-II superconductivity in the Dirac semimetal PdTe2
• Impact of Charge Density Waves on Superconductivity and Topological Properties in AV${}_3$Sb${}_5$ Kagome Superconductors
• Impact of charge-density-wave pattern on the superconducting gap in V-based kagome superconductors
• Inversion and Tunability of Van Hove Singularities in $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, and Cs) kagome metals
• Local pairing versus bulk superconductivity intertwined by the charge density wave order in Cs(V${}_{1-x}$Ta${}_x$)${}_3$Sb${}_5$
• Vortex phase diagram of kagome superconductor CsV${}_3$Sb${}_5$
• Calculated Unconventional Superconductivity via Charge Fluctuations in Kagome Metal CsV3Sb5
• Two-dimensional superconductivity in a thick exfoliated kagome film
• Evolution of charge correlations in the hole-doped kagome superconductor CsV${}_{3-x}$Ti${}_x$Sb${}_5$
• Yu-Shiba-Rusinov states in the s-wave superconducting kagome Hubbard model: Self-consistent Bogoliubov-de Gennes calculations
• Incommensurate charge-stripe correlations in the kagome superconductor CsV${}_3$Sb${}_{5-x}$Sn${}_x$
• Intrinsic coherence length anisotropy in nickelate, and some pnictide, and chalcogenide superconductors
• Current-induced magnetoresistance hysteresis in the kagome superconductor CsV${}_3$Sb${}_5$
• Strain-Tuned Nodal Superconductivity in the Charge-Ordered Kagome Metal CsV${}_3$Sb${}_5$
• Enhanced Coupling of Superconductivity and Evolution of Gap Structure in CsV3Sb5 through Ta Doping