Dresden 2026 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 17: Focus Session: High-Temperature Superconductivity in Hydride Materials at High Pressures (joint session TT/DS)

DS 17.4: Topical Talk

Donnerstag, 12. März 2026, 16:45–17:15, HSZ/0003

Near room-temperature conventional superconductivity in hydrogen-rich compounds at high pressures: Experimental evidences — •Vasily Minkov — Max Planck Institute for Chemistry, Mainz, Germany

The pioneering discovery of superconductivity in hydrogen sulfide (H3S) with a record Tc of 203 K at 150 GPa by M. Eremets et al. had a profound impact on the field. It validated the concept of high-Tc conventional superconductivity in hydrides and triggered an intense wave of research. Subsequent studies revealed that other hydrides - such as LaH10 and YH9 - exhibit Tc values approaching 250 K, bringing the field closer than ever to room-temperature superconductivity. Despite the experimental challenges associated with micrometer-sized samples confined in diamond anvil cells, superconductivity in these compounds has been demonstrated using multiple independent techniques. Electrical four-probe measurements provide clear resistive transitions, while recent advances in high-pressure magnetometry enable direct detection of magnetic field screening and flux expulsion. We have further developed a method to probe trapped magnetic flux in hydrides at high pressure. The distinct behavior of trapped flux generated under ZFC and FC conditions provides strong evidence for superconductivity. Furthermore, the recent adaptation of electron tunneling spectroscopy to extreme pressures offers microscopic insight into the pairing mechanism and enables direct characterization of the superconducting gap structure in the high-temperature hydride superconductors.

Keywords: superconductivity; hydrides; high pressure; trapped flux; electron tunneling spectroscopy