Superconducting dome and structural changes in LaRu3Si2 under pressure
Z. Li, S. Huyan, E. C. Thompson, T. J. Slade, D. Zhang, Y. J. Ryu, W. Bi, S. L. Bud'ko, P. C. Canfield
DOI 10.1103/PhysRevB.111.144505 · Physical Review B
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Abstract
LaRu3Si2 is of current research interest as a kagome metal with a superconducting transition temperature, Tc∼7 K, and higher-temperature charge density wave orders. Here we report on electrical transport and x-ray diffraction measurements on LaRu3Si2 under pressure up to 65 GPa and 35 GPa, respectively. The superconducting transition temperature Tc first gets slightly enhanced and reaches a maximum ∼8.7 K at ∼8.5 GPa. With further applied pressure, Tc is initially gradually suppressed, then more rapidly suppressed, followed by gradual suppression, revealing a superconducting dome. Two possible pressure-induced structural phase transitions are also observed at room temperature, from the original hexagonal phase to another hexagonal structure above ∼11.5 GPa, and further to a structure with lower symmetry above ∼23.5 GPa. These transition pressures roughly correlate with features found in our pressure-dependent transport data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7 | Pressure not reported | unknown |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.1 | Pressure unresolved | onset |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6.6 | Pressure unresolved | unknown |
| LaRu3Si2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.7 | 8.5 GPa | unknown |
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