2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/24246The 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.2+ pages. Proceedings of SCES'04. Final version. Added discussion on relevance to CePt3SiSuperconductivitytext