The possible role of van Hove singularities in the high Tc of superconducting H<sub>3</sub>S

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  • Thiago X. R. Souza
    Department of Physics, University of Alberta, Edmonton, AB, T6G 2E1, Canada
  • F. Marsiglio
    Department of Physics, University of Alberta, Edmonton, AB, T6G 2E1, Canada

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<jats:p> We observe that H<jats:sub>3</jats:sub>S has a BCC structure and, with nearest neighbor hopping only, a strong singularity occurs at zero energy. This singularity is accompanied with a highly nested Fermi surface, which is not conducive to a stable superconducting instability. Introduction of next-nearest-neighbor hopping removes the singularity, but a “robust” peak remains in the electron density of states. Solution of the BCS equations shows an enhanced superconducting [Formula: see text] due to this peak. Furthermore, nesting is no longer present, so other instabilities will not compete effectively with superconductivity. We find high critical temperatures are possible, even with very modest coupling strengths. We also examine a limit of the [Formula: see text] equations (in an Appendix) where an analytical solution is possible over the entire range of coupling strengths, and therefore the BCS-BEC crossover is fully covered. </jats:p>

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