Correlation between the dome-shaped superconducting phase diagram, charge order, and normal-state electronic properties in LaRu<sub>3</sub>Si<sub>2</sub>.
basic_science · Level V
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- Record sourced from PubMed, PMID 40610468.
- Also identified by DOI 10.1038/s41467-025-61383-z and PMC identifier 12229604.
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Abstract
The interplay between superconductivity and charge or spin order is a key focus in condensed matter physics, with kagome lattice systems providing unique insights. The kagome superconductor LaRu<sub>3</sub>Si<sub>2</sub> (T<sub>c</sub> ≃ 6.5 K) features a characteristic kagome band structure and a hierarchy of charge order transitions at T<sub>co,I</sub> ≃ 400 K and T<sub>co,II</sub> ≃ 80 K, along with an additional transition at T* ≃ 35 K associated with electronic and magnetic responses. Using magnetotransport under pressure up to 40 GPa, we find T<sub>c</sub> peaks at 9 K (2 GPa)-the highest among kagome superconductors-remains nearly constant up to 12 GPa, and then decreases to 2 K at 40 GPa, forming a dome-shaped phase diagram. Similarly, both the resistivity anomaly at T* and the magnetoresistance exhibit a dome-shaped pressure dependence. Moreover, above 12 GPa, X-ray diffraction reveals that the charge order evolves from long-range to short-range, coinciding with the suppression of T<sub>c</sub>. These observations indicate that superconductivity in LaRu<sub>3</sub>Si<sub>2</sub> is closely linked to the charge-ordered state and the electronic responses at T<sub>co,II</sub> and T*.