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TT: Fachverband Tiefe Temperaturen

TT 57: Correlated Magnetism – Kagome Systems

TT 57.10: Vortrag

Mittwoch, 11. März 2026, 17:30–17:45, CHE/0091

Unconventional gap structure in Kagome superconductor coupled to hybrid microwave resonators — •Yejin Lee, Haolin Jin, Berit Goodge, Edouard Lesne, Sushmita Chandra, and Uri Vool — Max Planck Institute for Chemical Physics of Solids, Dresden, Germany

Kagome superconductors have been recently discovered, offering a rich platform to study strongly correlated systems, including superconductivity, charge density wave, and time reversal symmetry broken states, and their electronic properties, featuring flat bands and van Hove singularities. Finding a pairing symmetry is crucial to understand the quantum phases interplay. Despite numerous experimental efforts focused on bulk crystals, there is no consensus for microscopic origin so far. Additionally, van der Waals flakes show distinct phases that are hard to probe with conventional methods. Superconducting microwave resonator is highly sensitive to detect the kinetic inductance and allows for studying the microwave response when hybridized with vdW layered flakes. Using this technique we investigate the pairing symmetry of the Kagome superconductor. We fabricate the CVS flake-coupled circuits with cryogenic transfer method, which preserves the pristine property and atomically sharp interface. We find any disorder in the flake disrupts coupling in the circuits that hinders the investigation of the low temperature properties. The temperature dependent resonance frequency shows a linear behavior, which deviate from a conventional fully gapped structure. The linear dependence is a signature for a nodal structure, as a hallmark of unconventional superconductivity.

Keywords: Kagome superconductors; Unconventional superconductivity; Microwave resonators; Hybrid microwave circuits; Van der Waals superconductors