2024/08/30 by S. Sinha, Sinha, S., Jinhyuk Lim +23
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Materials Science (cond-mat.mtrl-sci) #Rare-earth and actinide compounds #Superconductivity (cond-mat.supr-con) #Superconductivity in MgB2 and Alloys
paper · pdf · doi:10.48550/arxiv.2408.17416
openalex publication_date 2024/08/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
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.