Superconductivity in Kagome Metal YRu$_{3}$Si$_{2}$ with Strong Electron Correlations
Chunsheng Gong, Shangjie Tian, Zhijun Tu, Qiangwei Yin, Yang Fu, Ruitao Luo, and Hechang Lei*
Laboratory for Neutron Scattering, and Beijing Key Laboratory of Optoelectronic Functional Materials & MicroNano Devices, Department of Physics, Renmin University of China, Beijing 100872, China
Abstract：We report the detailed physical properties of YRu$_{3}$Si$_{2}$ with the Ru kagome lattice at normal and superconducting states. The results of resistivity and magnetization show that YRu$_{3}$Si$_{2}$ is a type-II bulk superconductor with $T_{\rm c}\sim 3.0$ 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.
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2022, Vol. 39 
