Regensburg 2016 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 22: Topical session: Integrated computational materials engineering for design of new materials V
MM 22.7: Vortrag
Dienstag, 8. März 2016, 13:15–13:30, H39
Bonding and electron-phonon interaction in high-Tc hydrides — Christoph Heil and •Lilia Boeri — University of Technology Graz
High-temperature superconductivity in hydrogen-rich compounds has been predicted by Ashcroft almost 50 years ago [1], yet was only recently observed in experiments by Drozdov et al. [2], who measured a critical temperature above 190 K in hydrogen-sulfide at 200 GPa pressure. In a similar experiment, the same group reported a Tc of 100 K in pressurised phosphine [3].
In this talk, I will show that the record-breaking Tc in H3S does not originate from the heavier atoms exerting pressure on the hydrogen lattice, but that it is due to the formation of unusually strong polar covalent bonds, stabilised under extreme pressures. I will discuss the bonding, electron-phonon coupling and the superconducting properties of sulfur-hydrides and highlight possible routes to realise similar bonding conditions in other hydrogen-rich compounds [4].
[1] N.W. Ashcroft, Phys. Rev. Lett. 21, 1748 (1968)
[2] A.P. Drozdov, M.I. Eremets and I.A. Troyan, Nature 525, 73 (2015)
[3] A.P. Drozdov, M.I. Eremets and I.A. Troyan, arXiv:1508.06224
[4] C. Heil and L. Boeri, Phys. Rev. B 92, 060508(R) (2015)