Berlin 2024 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 13: Kagome Systems

TT 13.2: Talk

Monday, March 18, 2024, 15:15–15:30, H 3010

Unconventional superconductivity on the kagome lattice — •Brian Møller Andersen, Sofie Castro Holbeak, Morten Holm Christensen, and Andreas Kreisel — Niels Bohr Institute, University of Copenhagen, DK-2200 Copenhagen, Denmark

Recent developments have focussed research on unusual electronic orders on the kagome lattice. This is evident mainly from the discovery of CDW phases and superconductivity in the AV₃Sb₅ (A:K, Rb, Cs) metals. We discuss the general expected form of superconductivity on the kagome lattice from charge- and spin-fluctuations. Some discussion will also be included on the potential role of orbital -selective phonons on the nature of superconductivity in the specific AV₃Sb₅ compounds. The second part of the talk addresses disorder on the kagome lattice. Surprisingly, unconventional superconductivity with sign-changing order parameters are remarkable robust to point-like nonmagnetic disorder. We demonstrate this effect by explicit calculations of bound states and Tc-suppression rates. The origin of the robustness is tied to the particular sublattice interference present for the electronic states on the kagome lattice.

Keywords: superconductivity of kagome materials; unconventional pairing; disorder; Impurity bound states; Tc suppression