SKM 2023 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 3: Superconductivity: Properties and Electronic Structure
TT 3.6: Vortrag
Montag, 27. März 2023, 10:45–11:00, HSZ 103
Clean-limit superconductivity at 197 K in high-pressure sulfur hydride — •Sam Cross1, Israel Osmond1, Owen Moulding1, Takaki Muramatsu1, Annabelle Brooks1, Oliver Lord2, Timofey Fedotenko3, Jonathan Buhot1, and Sven Friedemann1 — 1HH Wills Physics Laboratory, University of Bristol, UK — 2School of Earth Sciences, University of Bristol, UK — 3Photon Science, DESY, Germany
The search for room temperature superconductivity in hydrogen rich compounds has accelerated since the discovery of superconductivity in sulfur hydride, H3S, in 2015 [1]. Controlled synthesis of hydrides remains a challenge, and further work on the formation pathways will prove vital in the search for room temperature superconductivity in such compounds. Here we confirm the synthesis of cubic Im3m H3S by laser heating elemental sulfur and hydrogen donor ammonia borane, NH3BH3. Superconductivity is characterised using electrical transport measurements in a diamond anvil cell, confirming a transition temperature Tc = 197 K at 153 GPa, in agreement with previous studies. The coherence length extracted from measurements of the critical field Hc2 together with estimations of the carrier mean free path from the normal state resistance suggest that H3S follows clean-limit behaviour. The work further highlights the potential for in-situ synthesis of clean hydrides using ammonia borane, a more accessible synthesis alternative to pure hydrogen.
[1] A.P. Drozdov et al., Nature 525, 73 (2015)