2026/08/03 by Qi Wang, Juefei Wu, Cuiying Pei +3
Physics and Astronomy · #cond-mat.supr-con #cond-mat.mtrl-sci
paper · pdf · doi:10.1002/aelm.202500806
published as Advanced Electronic Materials 12 (10), e00806 (2026) · 8 pages, 7 figures
arxiv created 2026/08/03 · arxiv updated 2026/08/04
Dirac semimetal BaMg2Bi2 is reported to be a unique topological material that manifests surface superconductivity that coexistswith bulk band topology at ambient pressure. Here, we present a comprehensive investigation of high-pressure superconductingproperties in BaMg2Bi2 single crystal. Significantly, a pressure-driven double-dome superconducting behavior was revealed, withthe superconducting transition temperature Tc approaching the maximum values of 6.67 K at 4.5 GPa and 7.22 K at 10.4 GPafor the first and second superconducting domes, respectively. The combination of high-pressure X-ray diffraction, Hall resistivitymeasurements, and theoretical calculations demonstrates that, the first superconducting regime is closely related to the pressure-modulated Lifshitz transition, whereas the second superconducting phase emerges concurrently with a structural transition fromthe ambient-pressure P3m1 phase to a high-pressure Pnma phase.