Magnetotransport Measurements of Superconducting CaMg₂-H at High Pressures

Magnetotransport measurements on superconducting samples of CaMg2-H were performed at high pressures of up to 310 Gigapascals (GPa) and magnetic fields of up to 14 Tesla (T). Diamond anvil cells (DACs) specially designed for use in high magnetic fields were utilized in these experiments. We determine key superconducting properties, including upper critical field (Hc2), superconducting coherence length (ξ), and Fermi velocity (vF). Superconducting transition temperature Tc ranges from 50-170 K. High magnetic field suppresses the superconducting phase, which is well described by the Werthamer-Helfand-Hohenberg model. We find that the suppression of superconducting magnetic field is consistent with previously studies hydrides.