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  Spectroscopy of H3S: evidence of a new energy scale for superconductivity

Capitani, F., Langerome, B., Brubach, J.-B., Roy, P., Drozdov, A. P., Eremets, M. I., et al. (2016). Spectroscopy of H3S: evidence of a new energy scale for superconductivity. Retrieved from https://arxiv.org/abs/1612.06732.

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 Creators:
Capitani, F., Author
Langerome, B., Author
Brubach, J.-B., Author
Roy, P., Author
Drozdov, A. P.1, Author           
Eremets, M. I.1, Author           
Nicol, E. J., Author
Carbotte, J. P., Author
Timusk, T., Author
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              

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 Abstract: The discovery of a superconducting phase in sulfur hydride under high pressure with a critical temperature above 200 K has provided a new impetus to the search for even higher Tc. Theory predicted and experiment confirmed that the phase involved is H3S with Im-3m crystal structure. The observation of a sharp drop in resistance to zero at Tc, its downward shift with magnetic field and a Meissner effect confirm superconductivity but the mechanism involved remains to be determined. Here, we provide a first optical spectroscopy study of this new superconductor. Experimental results for the optical reflectivity of H3S, under high pressure of 150 GPa, for several temperatures and over the range 60 to 600 meV of photon energies, are compared with theoretical calculations based on Eliashberg theory using DFT results for the electron-phonon spectral density α2F(Ω). Two significant features stand out: some remarkably strong infrared active phonons at ≈ 160 meV and a band with a depressed reflectance in the superconducting state in the region from 450 meV to 600 meV. In this energy range, as predicted by theory, H3S is found to become a better reflector with increasing temperature. This temperature evolution is traced to superconductivity originating from the electron-phonon interaction. The shape, magnitude, and energy dependence of this band at 150 K agrees with our calculations. This provides strong evidence of a conventional mechanism. However, the unusually strong optical phonon suggests a contribution of electronic degrees of freedom.

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Language(s): eng - English
 Dates: 201620162016-12-20
 Publication Status: Published online
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 1612.06732
URI: https://arxiv.org/abs/1612.06732
 Degree: -

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