Understanding the mechanisms of unconventional superconductivity is a key objective in the study of quantum matter, particularly in materials where superconductivity emerges from a complex landscape of intertwined electronic orders. Kagome lattice systems, owing to their unique geometry of corner-sharing triangles, which gives rise to strong electronic frustration and a complex band structure, provide an ideal platform for exploring the fragile balance between multiple competing or cooperating quantum phases [1-4].

Motivated by LaRu₃Si₂ with a record-onset kagome superconductivity positively intertwined with the normal-state orders [5], we focus on its Y-substituted counterpart [6]. We report the discovery of a remarkably rich phase diagram in YRu₃Si₂ uncovered through a comprehensive suite of muon spin rotation (μSR), magnetotransport, X-ray diffraction, and density functional theory (DFT) [7]. We identify a high-temperature charge-ordered state with propagation vector (1/2, 0, 0) and a record onset temperature of 800 K, unprecedented in kagome systems and quantum materials more broadly. μSR measurements further reveal time-reversal symmetry-breaking below 25 K and field-induced magnetism near 90 K, features mirrored in the magnetoresistance, which reaches 45% at low temperatures. At low temperatures, YRu₃Si₂ becomes superconducting below T_c = 3.4 K with either two full isotropic gaps or an anisotropic nodeless gap. These results establish YRu₃Si₂ as a prime platform for studying correlated kagome physics.

[1] Y. Wang et al. Nat. Rev. Phys. 5, 635 (2023).
[2] Z. Guguchia et al., npj Quantum Mater. 8, 41 (2023).
[3] Z. Guguchia et al., Nat. Commun. 14, 153 (2023).
[4] J. N. Graham et al., Commun. Phys. 8, 318 (2025).
[5] K. Ma et al., Nat. Commun. 16, 6149 (2025).
[6] C. Gong et al., Chin. Phys. Lett. 39, 087401 (2022).
[7] P. Král et al., Nat. Commun., in press (2025).