The recent surprising discovery of superconductivity with critical temperature Tc = 32 K in MoB2 above 70 GPa has led to the search for related materials that may superconduct at similarly high Tc values and lower pressures. We have studied the superconducting and structural properties of Re0.10Mo0.90B2 to 170 GPa. A structural phase transition from R3m to P6/mmm commences at 48 GPa, with the first signatures of superconductivity appearing above 44 GPa. The critical temperature is observed to increase with pressure. A complete resistive transition is observed only above 150 GPa, where the highest onset Tc of 30 K is also achieved. Upon releasing pressure, the high pressure superconducting phase is found to be metastable. During unloading, a complete resistive superconducting transition is observed all the way down to 20 GPa (with onset Tc∼20 K). Our results suggest that the P6/mmm structure is responsible for the observed superconductivity.
@article{arxiv.2408.17416,
title = {Superconductivity in pressurized Re$_{0.10}$Mo$_{0.90}$B$_2$},
author = {S. Sinha and J. Lim and Z. Li and J. S. Kim and A. C. Hire and P. M. Dee and R. S. Kumar and D. Popov and R. J. Hemley and R. G. Hennig and P. J. Hirschfeld and G. R. Stewart and J. J. Hamlin},
journal= {arXiv preprint arXiv:2408.17416},
year = {2024}
}
Comments
7 pages, 7 figures, supplemental material. All data and analysis code associated with this work is available at https://doi.org/10.5281/zenodo.13359794