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DOE OSTI · 2571403

Superconducting dome and structural changes in LaRu 3 ⁢Si 2 under pressure

Li, Z. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0009000539662292)·Huyan, S. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000309992440)·Thompson, E. C. [Univ. of Alabama, Birmingham, AL (United States); Univ. of the South, Sewanee, TN (United States)] (ORCID:0000000259445595)·Slade, T. J. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000167514303)·Zhang, D. [Univ. of Chicago, IL (United States)] (ORCID:000000026679892X)·Ryu, Y. J. [Univ. of Chicago, IL (United States)] (ORCID:0000000213220198)·Bi, W. [Univ. of Alabama, Birmingham, AL (United States)] (ORCID:0000000220676556)·Bud'ko, S. L. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000236035585)·Canfield, P. C. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000277150643)
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Abstract

LaRu 3 ⁢Si 2 is of current research interest as a kagome metal with a superconducting transition temperature, 𝑇 𝑐 ∼7 K, and higher-temperature charge density wave orders. Here we report on electrical transport and x-ray diffraction measurements on LaRu 3 ⁢Si 2 under pressure up to 65 GPa and 35 GPa, respectively. The superconducting transition temperature 𝑇 𝑐 first gets slightly enhanced and reaches a maximum ∼8.7 K at ∼8.5 GPa. With further applied pressure, 𝑇 𝑐 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.

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75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITYKagome latticeantiferroelectricityhigh-pressure studiesresistivity measurementsstructural propertiessuperconductivityx-ray diffraction

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Li, Z. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0009000539662292), Huyan, S. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000309992440), Thompson, E. C. [Univ. of Alabama, Birmingham, AL (United States); Univ. of the South, Sewanee, TN (United States)] (ORCID:0000000259445595), Slade, T. J. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000167514303), Zhang, D. [Univ. of Chicago, IL (United States)] (ORCID:000000026679892X), Ryu, Y. J. [Univ. of Chicago, IL (United States)] (ORCID:0000000213220198), Bi, W. [Univ. of Alabama, Birmingham, AL (United States)] (ORCID:0000000220676556), Bud'ko, S. L. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000236035585), Canfield, P. C. [Ames Lab., and Iowa State Univ., Ames, IA (United States)] (ORCID:0000000277150643). 2025-04-16. Superconducting dome and structural changes in LaRu 3 ⁢Si 2 under pressure. https://doi.org/10.1103/physrevb.111.144505

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