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Journal of Superconductivity and Novel Magnetism

, Volume 30, Issue 1, pp 151–156 | Cite as

Multigap Superconductivity at Extremely High Temperature: A Model for the Case of Pressurized H2S

  • A. Bussmann-Holder
  • J. Köhler
  • A. Simon
  • M. Whangbo
  • A. BianconiEmail author
Original Paper

Abstract

It is known that in pressurized H2S, the complex electronic structure in the energy range of 200 meV near the chemical potential can be separated into two electronic components: the first characterized by steep bands with a high Fermi velocity and the second by flat bands with a vanishing Fermi velocity. Also, the phonon modes interacting with electrons at the Fermi energy can be separated into two components: hard modes with high energy around 150 meV and soft modes with energies around 60 meV. Therefore, we discuss here a multiband scenario in the standard Bardeen–Cooper–Schrieffer (BCS) approximation where the effective BCS coupling coefficient is in the range 0.1–0.32. We consider a first (second) BCS condensate in the strong (weak) coupling regime 0.32 (0.15). We discuss different scenarios segregated in different portions of the material. The results show the phenomenology of unconventional superconducting phases in this two-gap superconductivity scenario where there are two electronic components in two Fermi surface spots, and the pairing is mediated by either a soft or a hard phonon branch where the interband exchange term, also if small, plays a key role for the emergence of high-temperature superconductivity in pressurized sulfur hydride.

Keywords

Pressurized H2Multigap superconductivity Isotope effect 

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Copyright information

© Springer Science+Business Media New York 2017

Authors and Affiliations

  • A. Bussmann-Holder
    • 1
  • J. Köhler
    • 1
  • A. Simon
    • 1
  • M. Whangbo
    • 2
  • A. Bianconi
    • 3
    • 4
    Email author
  1. 1.Max Planck Institute for Solid State ResearchStuttgartGermany
  2. 2.Department of ChemistryNorth Carolina State UniversityRaleighUSA
  3. 3.Rome International Center for Materials Science Superstripes (RICMASS)RomeItaly
  4. 4.National Research Nuclear University, MEPhIMoscowRussia

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