Unconventional superconductivity protected from disorder on the kagome lattice

Abstract

Motivated by the recent discovery of superconductivity in the kagome $A$V${}_3$Sb${}_5$ ($A$: K, Rb, Cs) metals, we perform a theoretical study of the symmetry-allowed superconducting orders on the two-dimensional kagome lattice with focus on their response to disorder. We uncover a qualitative difference between the robustness of intraband spin-singlet (even-parity) and spin-triplet (odd-parity) unconventional superconductivity to atomic-scale nonmagnetic disorder. Due to the particular sublattice character of the electronic states on the kagome lattice, disorder in spin-singlet superconducting phases is only weakly pair-breaking despite the fact that the gap structure features sign changes. By contrast, spin-triplet condensates remain fragile to disorder on the kagome lattice. We demonstrate these effects in terms of the absence of impurity bound states and an associated weak disorder-induced $T_c$-suppression for spin-singlet order. We also discuss the consequences for quasi-particle interference and their inherent tendency for momentum-space anisotropy due to sublattice effects on the kagome lattice. For unconventional kagome superconductors, our results imply that any allowed spin-singlet order, including for example $d+id$-wave superconductivity, exhibits a disorder-response qualitatively similar to standard conventional $s$-wave superconductors.

16 pages, 12 figures

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Cited by in corpus (23)

• AV${}_3$Sb${}_5$ Kagome Superconductors: Progress and Future Directions
• The kagome Hubbard model from a functional renormalization group perspective
• Spontaneous time-reversal symmetry breaking by disorder in superconductors
• Kagome metals
• Evidence of a distinct collective mode in Kagome superconductors
• Existence of Hebel-Slichter peak in unconventional kagome superconductors
• AV${}_3$Sb${}_5$ kagome superconductors: a review with transport measurements
• Probing the pairing symmetry in kagome superconductors based on the single-particle spectrum
• Observation of Anomalous Thermal Hall Effect in a Kagome Superconductor
• Disorder-dependent superconducting pairing symmetry in doped graphene
• Interplay of superconductivity and charge-density-wave order in kagome materials
• Theory of potential impurity scattering in pressurized superconducting La${}_3$Ni${}_2$O${}_7$
• Photoemission Insights to Electronic Orders in Kagome Superconductor AV3Sb5
• Impact of charge-density-wave pattern on the superconducting gap in V-based kagome superconductors
• Probing Sign-Changing Order Parameters via Impurity States in unconventional superconductors: Implications for La${}_3$Ni${}_2$O${}_7$ Superconductors with interlayer pairing
• Recent progress in quantum spin liquids, fractional magnetization plateaus, and unconventional superconductivity in kagome lattices
• Majorana edge states in s-wave kagome superconductors with Rashba interaction
• The possible frustrated superconductivity in the kagome superconductors
• Strain-Tuned Nodal Superconductivity in the Charge-Ordered Kagome Metal CsV${}_3$Sb${}_5$
• Topological pair density waves in kagome superconductors
• Layer-Resolved Impurity States Reveal Competing Pairing Mechanisms in Trilayer Nickelate Superconductor La${}_4$Ni${}_3$O${}_{10}$
• Electronic and structural properties of Rh- and Pd-based kagome layered shandites from first principles
• Engineering magnetic anisotropy and ferromagnetism in topological Kagome metal GdV6Sn6 via Nd substitution