Abstract
In a metal with multiple Fermi pockets, the formation of s-wave superconductivity can be conventional due to electron-phonon coupling or unconventional due to spin fluctuations. We analyze the hexagonal diboride CrB₂, which is an itinerant antiferromagnet at ambient conditions and turns superconducting upon increasing pressure. While the high-pressure behavior of T꜀ suggests conventional s-wave pairing, we find that spin fluctuations promoting unconventional s-wave pairing become important in the vicinity of the antiferromagnetic dome. As the symmetry class of the s-wave state is independent of its underlying mechanism, we argue that CrB₂ is a realization of a hybrid s-wave superconductor where unconventional and conventional s-wave mechanisms team up to form a joint superconducting dome. Show more
Publication status
publishedExternal links
Journal / series
Physical Review BVolume
Pages / Article No.
Publisher
American Physical SocietySubject
Multiband superconductivity; Pairing mechanisms; Superconducting gap; Superconducting order parameter; SuperconductivityMore
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