Multidome superconductivity in charge density wave kagome metals

Abstract

Motivated by recent experiments on the kagome metals $A{\text{V}}_3{\text{Sb}}_5$ with $A=\text{K}$, $\text{Rb}$, and $\text{Cs}$, which show a charge density wave (CDW) at $\sim 100$ K and the superconductivity at $\sim 1$ K, we explore the onset of the superconductivity, taking the perspective that it descends from a parent CDW. We argue that viewing the superconductivity as a weak-coupling instability of a reconstructed (by the CDW) Fermi surface naturally explains the experimentally observed 'multidome' nonmonotonic dependence on pressure, with the 'peaks' in the superconducting critical temperature being associated with the Van Hove singularities of the reconstructed Fermi surface. This 'parent-child relationship' also naturally explains the large separation of energy scales between the superconductivity and the CDW. We discuss different possible pairing mechanisms and speculate that the CDW or reconstructed Pomeranchuk fluctuations may mediate the pairing interaction.

9 pages, 4 figures. v3: Published version

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Cited by in corpus (22)

• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• Chern Fermi pocket, topological pair density wave, and charge-4e and charge-6e superconductivity in kagome superconductors
• Loop-current charge density wave driven by long-range Coulomb repulsion on the kagome lattice
• Superconductivity from repulsive interactions on the kagome lattice
• Interplay between Pair Density Wave and a Nested Fermi Surface
• Commensurate-to-incommensurate transition of charge-density-wave order and a possible quantum critical point in pressurized kagome metal CsV${}_3$Sb${}_5$
• Unconventional superconductivity protected from disorder on the kagome lattice
• Superconductivity from Orbital-Selective Electron-Phonon Coupling in $A{\mathrm{V}}_3{\mathrm{Sb}}_5$
• Effect of nonhydrostatic pressure on the superconducting kagome metal CsV${}_3$Sb${}_5$
• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• Impact of the orbital current order on the superconducting properties of the kagome superconductors
• Interplay between Chiral Charge Density Wave and Superconductivity in Kagome Superconductors: A Self-consistent Theoretical Analysis
• Kagome materials $A$V${}_3$Sb${}_5$ ($A$=K,Rb,Cs): pairing symmetry and pressure-tuning studies
• Pair-breaking scattering interference as a mechanism for superconducting gap modulation
• Tuning electronic pairing by uniaxial strain in kagome lattices
• Topological Quantum Computation on a Chiral Kondo Chain
• Topological Superconducting States and Quasiparticle Transport on Kagome Lattice
• Theories for charge-driven nematicity in kagome metals
• Charge-density wave fluctuation driven composite order in the layered Kagome Metals
• The possible frustrated superconductivity in the kagome superconductors
• Electronic and structural properties of Rh- and Pd-based kagome layered shandites from first principles
• Reaching Quantum Critical Point by Adding Non-magnetic Disorder in Single Crystals of Superconductor $({\text{Ca}}_x{\text{Sr}}_{1-x}{)}_3{\text{Rh}}_4{\text{Sn}}_{13}$