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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 T_c = 197 K at 153 GPa, in agreement with previous studies. The coherence length extracted from measurements of the critical field H_c2 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)