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SUMMARY:Pathways towards High-Temperature Superconductivity - Sven Friedem
 ann - HH Wills Physics Laboratory\, University of Bristol\, UK
DTSTART:20250514T101500Z
DTEND:20250514T110000Z
UID:TALK228196@talks.cam.ac.uk
CONTACT:Mads Fonager Hansen
DESCRIPTION:I will present how high-pressure research provides insight int
 o optimising superconductivity. I will present studies of hydride supercon
 ductors\, where high-energy lattice phonons couple to hydrogen orbitals in
  structures stabilised at very high pressures only. \nRecord superconducti
 vity has been discovered in H3S\, LaH10\, YH9\, and other hydride compound
 s [1–3]. However\, experimental studies of superconductivity in hydrides
  remain an enormous challenge. We have characterised superconductivity in 
 H3S and we have discovered the new superconductor La4H23  [4]. These measu
 rements have been made possible through developments of robust thin-film m
 ethods for high-pressure research.\nIn TiSe2\, we observe a dome of superc
 onductivity around the quantum critical point of the charge-density-wave o
 rder [5]. We show that superconductivity only emerges once a Lifshitz tran
 sition releases electron and hole pockets connected by the wave vector of 
 the charge order. This suggests s± superconductivity mediated by CDW fluc
 tuations analogue to some of the iron pnictide superconductors.\n\n[1]	Kon
 g\, P. et al. Nature Communications 12\, 5075 (2021).\n\n[2]	Somayazulu\, 
 M. et al. Phys. Rev. Lett. 122\, 027001 (2019).\n\n[3]	Drozdov\, A. P. et 
 al. Nature 525\, 73 (2015).\n\n[4]	Cross\, S. et al. Phys. Rev. B 109\, L0
 20503 (2024).\n\n[5]	Hinlopen\, R. D. H. et al. arXiv:2308.02475 (2023).\n
 \n
LOCATION:Mott Seminar Room (531)\, Cavendish Laboratory\, Department of Ph
 ysics
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