Are Th doped Y2C3 and La2C3 two-band superconductors?
I.A. Sergienko
TL;DR
This paper investigates the two-band superconducting behavior in Th-doped Y2C3 and La2C3 sesquicarbides, emphasizing the role of symmetry and spin-orbit coupling in their electronic structure.
Contribution
It reveals how high symmetry and spin-orbit coupling induce two-band effects in the superconducting state of these sesquicarbides.
Findings
Spin-orbit coupling lifts spin degeneracy in electronic bands.
High symmetry causes Fermi surfaces to touch along certain directions.
Two-band effects are present in the superconducting state.
Abstract
The superconducting sesquicarbides R2C3 have noncentrosymmetric point group symmetry Td. Spin-orbit coupling lifts the spin degeneracy of electronic bands in the most of the Brillouin zone. Nevertheless, due to high symmetry, there are a few directions along which the Fermi surfaces must touch. This leads to the two-band effects in the superconducting state.
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