LaRu3Si2 is of current research interest as a kagome metal with a superconducting transition temperature, Tc∼7 K and higher temperature charge density wave (CDW) orders. Here we report 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 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.
@article{arxiv.2503.11873,
title = {Superconducting dome and structural changes in LaRu$_3$Si$_2$ under pressure},
author = {Zhuoqi Li and Shuyuan Huyan and Elizabeth C. Thompson and Tyler J. Slade and Dongzhou Zhang and Young J. Ryu and Wenli Bi and Sergey L. Bud'ko and Paul C. Canfield},
journal= {arXiv preprint arXiv:2503.11873},
year = {2025}
}