What superconducts in sulfur hydrides under pressure and why

  title={What superconducts in sulfur hydrides under pressure and why},
  author={Noam Bernstein and C. Stephen Hellberg and Michelle D. Johannes and Igor I. Mazin and Michael J. Mehl},
  journal={Physical Review B},
The recent discovery of superconductivity at 190~K in highly compressed H$_{2}$S is spectacular not only because it sets a record high critical temperature, but because it does so in a material that appears to be, and we argue here that it is, a conventional strong-coupling BCS superconductor. Intriguingly, superconductivity in the observed pressure and temperature range was predicted theoretically in a similar compound H$_{3}$S. Several important questions about this remarkable result, however… 

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