Nodeless superconductivity in kagome metal CsV${}_3$Sb${}_5$ with and without time reversal symmetry breaking

Abstract

The kagome metal CsV${}_3$Sb${}_5$ features an unusual competition between the charge-density-wave (CDW) order and superconductivity. Evidence for time-reversal symmetry breaking (TRSB) inside the CDW phase has been accumulating. Hence, the superconductivity in CsV${}_3$Sb${}_5$ emerges from a TRSB normal state, potentially resulting in an exotic superconducting state. To reveal the pairing symmetry, we first investigate the effect of nonmagnetic impurity. Our results show that the superconducting critical temperature is insensitive to disorder, pointing to conventional $s$-wave superconductivity. Moreover, our measurements of the self-field critical current ($I_{c,sf}$), which is related to the London penetration depth, also confirm conventional $s$-wave superconductivity with strong coupling. Finally, we measure $I_{c,sf}$ where the CDW order is removed by pressure and superconductivity emerges from the pristine normal state. Our results show that $s$-wave gap symmetry is retained, providing strong evidence for the presence of conventional $s$-wave superconductivity in CsV${}_3$Sb${}_5$ irrespective of the presence of the TRSB

8 pages, 4 figures. Nano Letters (in press)

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• 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
• Drastic magnetic-field-induced chiral current order and emergent current-bond-field interplay in kagome metals
• Superconductivity from Orbital-Selective Electron-Phonon Coupling in $A{\mathrm{V}}_3{\mathrm{Sb}}_5$
• Anomalous Hall effect and two-dimensional Fermi surfaces in the charge-density-wave state of kagome metal RbV${}_3$Sb${}_5$
• The kagome Hubbard model from a functional renormalization group perspective
• Quantifying interaction mechanism in infinite layer nickelate superconductors
• Kagome metals
• Large Fermi surface in pristine kagome metal CsV${}_3$Sb${}_5$ and enhanced quasiparticle effective masses
• Similarities and Differences in the Fermiology of Kagome Metals AV${}_3$Sb${}_5$ (A=K, Rb, Cs) Revealed by Shubnikov-de Haas Oscillations
• A-15 type superconducting hydride $L{a}_4{H}_{23}$: Nanograined structure with low strain, strong electron-phonon interaction, and moderate level of nonadiabaticity
• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
• $d$-wave superconductivity as a model for diborides apart MgB${}_2$
• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Observation of Anomalous Thermal Hall Effect in a Kagome Superconductor
• Probing the pairing symmetry in kagome superconductors based on the single-particle spectrum
• Lifshitz transition enabling superconducting dome around the quantum critical point in TiSe${}_2$
• Quantum-metric-induced giant and reversible nonreciprocal transport phenomena in chiral loop-current phases of kagome metals
• Low temperature phase transitions under CDW state in kagome metals AV3Sb5 (A=Cs,Rb,K): Significance of mix-type Fermi surface electron correlations
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Discovery of a new phase in thin flakes of KV${}_3$Sb${}_5$ under pressure
• Quantum Phase Transition as a Promising Route to Enhance the Critical Current in Kagome Superconductor CsV${}_3$Sb${}_5$
• Inversion and Tunability of Van Hove Singularities in $A$V${}_3$Sb${}_5$ ($A$ = K, Rb, and Cs) kagome metals
• Impact of Charge Density Waves on Superconductivity and Topological Properties in AV${}_3$Sb${}_5$ Kagome Superconductors
• Origin of switchable quasiparticle-interference chirality in loop-current phase of kagome metals measured by scanning-tunneling-microscopy
• Two-dimensional superconductivity in a thick exfoliated kagome film
• Calculated Unconventional Superconductivity via Charge Fluctuations in Kagome Metal CsV3Sb5
• Vortex phase diagram of kagome superconductor CsV${}_3$Sb${}_5$
• Odd-parity quadrupole order and induced nonreciprocal transport in the kagome metal CsTi${}_3$Bi${}_5$ driven by quantum interference
• Superconducting critical temperature and dimensionality tuning of RbV${}_3$Sb${}_5$ via biaxial strain
• Point-contact Andreev reflection spectroscopy of layered superconductors with device-integrated diamond anvil cells
• Giant Impurity Effects on Charge Loop Current Order States in Kagome Metals
• Microscopic origin of period-four stripe charge-density-wave in kagome metal CsV${}_3$Sb${}_5$
• Enhanced Coupling of Superconductivity and Evolution of Gap Structure in CsV3Sb5 through Ta Doping