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- Title
The possible role of van Hove singularities in the high of superconducting H<sub>3</sub>S.
- Authors
Souza, Thiago X. R.; Marsiglio, F.
- Abstract
We observe that H3S 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 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 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.
- Subjects
FERMI surfaces; ELECTRON density; SUPERCONDUCTIVITY; HIGH temperature superconductivity; ENERGY-band theory of solids
- Publication
International Journal of Modern Physics B: Condensed Matter Physics; Statistical Physics; Applied Physics, 2017, Vol 31, Issue 25, p-1
- ISSN
0217-9792
- Publication type
Article
- DOI
10.1142/S0217979217450035