Superconductivity in kagome metal YRu3Si2 with strong electron correlations

Abstract

We report the detailed physical properties of YRu3Si2 with the Ru kagome lattice at normal and superconducting states. The results of resistivity and magnetization show that YRu3Si2 is a type-II bulk superconductor with Tc ~ 3.0 K. The specific heat measurement further suggests that this superconductivity could originate from the weak or moderate electron-phonon coupling. On the other hand, both large Kadawaki-Woods ratio and Wilson ratio indicate that there is a strong electron correlation effect in this system, which may have a connection with the featured flat band of kagome lattice.

6 pages, 5 figures, 1 table

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• Crossover between electron-electron and electron-phonon mediated pairing on the Kagome lattice
• Superconductivity in kagome metal ThRu3Si2
• Probing the pairing symmetry in kagome superconductors based on the single-particle spectrum
• Intriguing kagome topological materials
• Electronic Correlation Effects on Stabilizing a Perfect Kagome Lattice and Ferromagnetic Fluctuation in LaRu${}_3$Si${}_2$
• Chemical enhancement of superconductivity in LaRu3Si2 with mode-selective coupling between kagome phonons and flat bands
• Bulk superconductivity in the kagome metal YRu3B2
• Superconductivity and Electron Correlations in Kagome Metal LuOs3B2
• Recent progress in quantum spin liquids, fractional magnetization plateaus, and unconventional superconductivity in kagome lattices