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TT: Fachverband Tiefe Temperaturen

TT 93: Superconductivity – Poster II

TT 93.18: Poster

Donnerstag, 12. März 2026, 18:00–20:00, P4

Granularity-induced higher harmonics in the Little-Parks effect of Kagome superconductors — •Artem Kokovin¹, Daniel Schultz¹, and Jörg Schmalian^1,2 — ¹Institut für Theorie der Kondensierten Materie, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — ²Institut für Quantenmaterialien und Technologien, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany

We develop a theoretical framework for the emergence of higher-order harmonics in the Little-Parks oscillations observed in Kagome superconductors. Motivated by recent experiments suggesting that certain Kagome compounds exhibit pronounced granularity, an effect that appears to be enhanced by the onset of charge-density-wave order, we construct a two-stage model capturing the interplay of microscopic and mesoscopic physics. On the microscopic level, we derive the effective Josephson coupling of a granular structure, including higher-harmonic contributions to the coupling. On the mesoscopic level, we analyze the magnetic-field dependence of the superconducting free energy in the presence of these Josephson couplings, demonstrating how disorder and granularity convert these Josephson interactions into higher-order Little-Parks oscillations. Our central result is that such higher harmonics naturally arise when the underlying pairing state in Kagome materials is unconventional, providing a clear diagnostic for identifying nontrivial superconducting order in this family of systems.

Keywords: Kagome superconductors; Josephson Networks