Superconductivity in f-electron systems controlled by crystalline electric fields

Abstract In order to understand effects of a crystalline electric field (CEF) on superconductivity and antiferromagnetism in f-electron systems, we study an f-electron model with total angular momentum j = 5 2 on a square lattice by using the fluctuation exchange approximation. In particular, we focus on the role of orbital states under the CEF. We find that the competition between antiferromagnetism and superconductivity sensitively depends on the character of the orbital states.