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arXiv · 2209.13299

Clean-limit superconductivity in Im-3m H3S synthesized from sulfur and hydrogen donor ammonia borane

Israel Osmond·Owen Moulding·Sam Cross·Takaki Muramatsu·Annabelle Brooks·Oliver Lord·Timofey Fedotenko·Jonathan Buhot·Sven Friedemann
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Abstract

We present detailed studies of the superconductivity in high-pressure H3S. X-ray diffraction measurements show that cubic Im-3m H3S was synthesized from elemental sulfur and hydrogen donor ammonia borane (NH3BH3). Our electrical transport measurements confirm superconductivity with a transition temperature Tc = 197 K at 153 GPa. From the analysis of both the normal state resistivity and the slope of the critical field, we conclude that the superconductivity is described by clean-limit behaviour. A significant broadening of the resistive transition in finite magnetic field is found, as expected for superconductors. We identify a linear temperature-over-field scaling of the resistance at the superconducting transition which is not described by existing theories.

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Israel Osmond, Owen Moulding, Sam Cross, Takaki Muramatsu, Annabelle Brooks, Oliver Lord, Timofey Fedotenko, Jonathan Buhot, Sven Friedemann. 2022-09-27. Clean-limit superconductivity in Im-3m H3S synthesized from sulfur and hydrogen donor ammonia borane. https://doi.org/10.1103/physrevb.105.l220502

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