NbGe${}_{2}$ is a type-I full-gap bulk chiral superconductor with Kramers-Weyl fermions and an enhanced critical field from filamentary superconductivity. Quantum oscillations and first-principles calculations reveal two hole Fermi pockets centered… Click to show full abstract
NbGe${}_{2}$ is a type-I full-gap bulk chiral superconductor with Kramers-Weyl fermions and an enhanced critical field from filamentary superconductivity. Quantum oscillations and first-principles calculations reveal two hole Fermi pockets centered around the Weyl $M$ point and one trivial hole pocket near the $H$ point in the Brillouin zone. The authors attribute the electron-phonon mediated superconductivity to the Van Hove singularity arising from the saddle-point-like dispersion at the $M$ and $H$ points near the Fermi level.
Journal Title: Physical Review B
Year Published: 2020
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