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 17.7: Vortrag
Donnerstag, 12. März 2026, 18:00–18:15, HSZ/0003
Above-room-temperature superconductivity in substituted LaHx superhydride — •Stanley Tozer and Audrey Grockowiak — Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, 01069 Dresden, Germany
We have synthesized a higher order La-based superhydride with initial superconducting transition temperature of 294 K that, when heated, morphed into a higher order system with a Tc onset of 556 K and a transition width of approximately 120 K [1]. The x-ray and the electrical transport data support one another with regard to the pressure measured, and the inhomogeneous nature of the synthesis that resulted in a substituted higher order La-based superhydride in close proximity to FIBed electrodes with a broad multi-phase, irreversible transition and non-zero background resistance below Tc. The electric leads embedded in our ’crucible’ probe a pathway through this inhomogeneous growth, a very small portion of which is the superconductor of interest. We have used informed growth to reproduce the initial result in a range of pressures lower than allowed for the binary LaH10. A multi-probe approach is being implemented to address growth-to-growth variations and follow the transformation of the initial 294 K superconductor. This will provide an understanding of this new class of superconductor that begs the question as to the upper limit of superconductivity in the superhydrides and whether BCS theory can describe them.
[1] A.D. Grockowiak et al., Electronic Materials 2, (2022)
[2] doi.org10.3389/femat.2022.837651
Keywords: high pressure; superhydride; superconductor