High-temperature Superconductivity in Hydrides at High Pressures

General interest seminar

High-temperature Superconductivity in Hydrides at High Pressures

  • Event time: 5:00pm until 6:00pm
  • Event date: 7th February 2022
  • Speaker: Prof Sven Friedemann (University of Bristol)
  • Location: Lecture Theatre A and online

Event details

High-temperature Superconductivity in Hydrides at High Pressures 

Prof Sven Friedemann is based at the HH Wills Physics Laboratory, University of Bristol.

A new area of record superconductivity has been heralded by the discovery of superconductivity at 200 K in sulphur hydride SH3 in 2015 [1]. Since, further superconductors with transition temperatures up to 288 K have been reported in LaH10, YH9, and carbonaceous sulphur hydride [2–4]. Many of these discoveries were guided by theory. Experimental studies of the superconductivity in hydride superconductors have only been reported by a hand full of groups owing to the enormous challenges to conduct experiments at pressures above 100 GPa in diamond anvil pressures cells. Here, I will present our recent results on superconductivity in SH3, LaH4, and YH4. Our results provide the first independent confirmation of superconductivity in SH3. Our results on LaH4 reveal a novel form of the critical fields and suggest a very strong electron-phonon coupling constant. I will discuss our unique experimental approach using thin-film techniques [5] in the preparation of samples for high-pressure studies and how these might allow further studies and potentially applications of hydride superconductivity.

[1]  Drozdov, A. P. et al. Nature 525, 73 (2015).

[2]  Somayazulu, M. et al. Phys. Rev. Lett. 122, 027001 (2019).

[3]  Snider, E. et al. Nature 586, 373–377 (2020).

[4]  Kong, P. et al. Nature Communications 12, 5075 (2021).

[5]  Buhot, J. et al. Phys. Rev. B 102, 104508 (2020). 

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Our General Interest Seminars are an opportunity for distinguished speakers to present new research in physics and related areas. The material presented is suitable for undergraduate level upwards and all members of the School are welcome to attend..

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