Charge order above room-temperature in a prototypical kagome superconductor La(Ru${}_{1-x}$Fe${}_x$)${}_3$Si${}_2$

Abstract

The kagome lattice is an intriguing and rich platform for discovering, tuning and understanding the diverse phases of quantum matter, which is a necessary premise for utilizing quantum materials in all areas of modern and future electronics in a controlled and optimal way. The system LaRu${}_3$Si${}_2$ was shown to exhibit typical kagome band structure features near the Fermi energy formed by the Ru-$d{z}^2$ orbitals and the highest superconducting transition temperature $T_{\mathrm{c}}$ $\simeq$ 7K among the kagome-lattice materials. However, the effect of electronic correlations on the normal state properties remains elusive. Here, we report the discovery of charge order in La(Ru${}_{1-x}$Fe${}_x$)${}_3$Si${}_2$ ($x$ = 0, 0.01, 0.05) beyond room-temperature. Namely, single crystal X-ray diffraction reveals charge order with a propagation vector of ($\frac{1}{4}$,0,0) below $T_{\mathrm{CO}-\mathrm{I}}$ $\simeq$ 400K in all three compounds. At lower temperatures, we see the appearance of a second set of charge order peaks with a propagation vector of ($\frac{1}{6}$,0,0). The introduction of Fe, which is known to quickly suppress superconductivity, does not drastically alter the onset temperature for charge order. Instead, it broadens the scattered intensity such that diffuse scattering appears at the same onset temperature, however does not coalesce into sharp Bragg diffraction peaks until much lower in temperature. Our results present the first example of a charge ordered state at or above room temperature in the correlated kagome lattice with bulk superconductivity.

15 pages, 8 figures

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Cited by in corpus (12)

• Kagome metals
• Origin of competing charge density waves in kagome metal ScV${}_6$Sn${}_6$
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• Bulk superconductivity in the kagome metal YRu3B2
• Successive orthorhombic distortions in kagome metals by molecular orbital formation
• Superconductivity and Electron Correlations in Kagome Metal LuOs3B2
• Persistence of small polarons into the superconducting phase of Ba${}_{1-x}$K${}_x$BiO${}_3$
• Pressure suppresses the density wave order in kagome metal LuNb${}_6$Sn${}_6$
• Density-wave like behavior in a new Kagome material Ce${}_2$Ru${}_3$Si
• Magnetostructural Coupling at the Néel point in YNiO3 Single Crystals
• Beyond kagome: $p$-bands in kagome metals