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SUMMARY:High-temperature Superconductivity in Hydrides at High Pressures -
  Dr. Sven Friedemann
DTSTART:20220309T111500Z
DTEND:20220309T123000Z
UID:TALK169466@talks.cam.ac.uk
CONTACT:Malte Grosche
DESCRIPTION:A new area of record superconductivity has been heralded by th
 e discovery of superconductivity at 200 K in sulphur hydride SH3 in 2015 [
 1]. Since the initial discovery\, further superconductors with transition 
 temperatures up to 288 K have been reported in LaH10\, YH9\, and carbonace
 ous sulphur hydride [2–4]. Experimental studies of the superconductivity
  in hydride superconductors have only been reported by a hand full of grou
 ps owing to the enormous challenges to conduct experiments at pressures ab
 ove 100 GPa in diamond anvil pressures cells. Here\, I will present our re
 cent experimental results on superconductivity in SH3\, LaH4\, and YH4. Ou
 r results provide the first independent confirmation of superconductivity 
 in SH3. I will discuss results of detailed transport studies including in 
 very high magnetic fields.  We find forms of the critical field that sugge
 st a strong electron-phonon coupling and multiband superconductivity in so
 me of the hydride superconductors. 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 potent
 ially applications of hydride superconductivity. \n\n[1]	Drozdov\, A. P. e
 t al. Nature 525\, 73 (2015).\n\n[2]	Somayazulu\, M. et al. Phys. Rev. Let
 t. 122\, 027001 (2019).\n\n[3]	Snider\, E. et al. Nature 586\, 373–377 (
 2020).\n\n[4]	Kong\, P. et al. Nature Communications 12\, 5075 (2021).\n\n
 [5]	Buhot\, J. et al. Phys. Rev. B 102\, 104508 (2020).\n
LOCATION:Mott Seminar Room
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