Electronic Correlation Effects on Stabilizing a Perfect Kagome Lattice and Ferromagnetic Fluctuation in LaRu${}_3$Si${}_2$

Abstract

A perfect Kagome lattice features flat bands that usually lead to strong electronic correlation effects, but how electronic correlation, in turn, stabilizes a perfect Kagome lattice has rarely been explored. Here, we study such effect in a superconducting ($T_c\sim 7.8$ K) Kagome metal LaRu${}_3$Si${}_2$ with a distorted Kagome plane consisting of pure Ru ions, using density functional theory plus $U$ and plus dynamical mean-field theory. We find that increasing electronic correlation can stabilize a perfect Kagome lattice and induce substantial ferromagnetic fluctuations in LaRu${}_3$Si${}_2$. By comparing the calculated magnetic susceptibilities to experimental data, LaRu${}_3$Si${}_2$ is found to be on the verge of becoming a perfect Kagome lattice. It thus shows moderate but non-negligible electronic correlations and ferromagnetic fluctuations, which are crucial to understanding the experimentally observed non-Fermi-liquid behavior and the pretty high superconducting $T_c$ of LaRu${}_3$Si${}_2$.

arXiv comment4 pages and 4 figures in main text. Appear soon in JUSTC

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Cited by in corpus (4)

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• Encoding innumerable charge density waves of FeGe into polymorphs of LiFe6Ge6
• Correlation stabilized ferromagnetic MnRuAs with distorted kagome lattice
• Slow ferromagnetic fluctuations in the kagome metal Sc${}_3$Mn${}_3$Al${}_7$Si${}_5$ revealed by ${}^{27}$Al NMR