Electronic structure and de Haas-van Alphen quantities of CeMIn5 (M=Co, Rh, and Ir) compounds

We report a critical analysis of the electronic structures and de Haas-van Alphen (dHvA) quantities of the heavy-fermion superconductors CeCoIn5, CeRhIn5, and CeIrIn5. The ab initio calculated dHvA quantities are in good agreement with experimental data for CeCoIn5 and CeIrIn5, when we adopt the delocalized LSDA description for the Ce 4f states. For CeRhIn5, however, a better agreement with experiment is obtained when the Ce 4f electron is treated as a localized core electron. The implications for an emerging picture of the localization behavior of the 4f electron in these materials are discussed.